New private framework bridging FoundationModels with SwiftUI appeared in the SDK with no public API surface yet.

SpotlightSearchTool.Guide gains three new members (complete, dynamic(_:), focused(_:)) for controlling search guidance, while CoreSpotlightSource.sourceOptions is removed.

Minor addition — a new dataDetection(_:options:) modifier on View enables data detection configuration directly in SwiftUI.

The generic constraint on Attachment was relaxed from requiring AttachmentContent conformance to unconstrained Content, and init(_:orientation:) gained a new signature.

All public EntityProperty initializers have been removed along with the CVReadOnlyPixelBuffer class, both of which are breaking removals for any code that constructed EntityProperty directly or used pixel buffer entity parameters.

AppEntityIdentifier struct has been removed entirely, along with its initializer and properties.

The ActivationExtension and ActivationExtensionConfiguration protocols have been renamed to AppManagedFeaturesExtension and AppManagedFeaturesExtensionConfiguration, with a new appManagedFeaturesEnrollmentFailed error case added to AppManagedFeaturesError.

Several MusicPlayer, MusicSequence, MusicTrack, and MusicEventIterator C functions have been annotated with CA_REALTIME_API, indicating they are now formally marked as safe to call from real-time audio threads.

allowsAccessibilitySpeech is deprecated in favor of the new allowsAccessibilitySpokenContent property (available iOS 27+/macOS 27+).

AVProVideoStorage gains a typed busyReasons set (replacing the boolean busy property) and a new replenishCapacityWithCompletionHandler: method, while two AVSampleBufferVideoRenderer enum cases tighten their associated-value error type from optional to non-optional any Error.

• AVSampleBufferRenderSynchronizer.removeReceiver(receiver:at:) was renamed to removeReceiver(_:at:), dropping the argument label.

The entire AVPlaybackUserInterface* protocol family (previously marked unavailable on iOS) is now available on iOS 27.0, replacing the now-deprecated AVInterface* types from the same SDK version.

• The AVInterfaceControllable-family types introduced in iOS 27.0 are immediately deprecated with migration messages pointing to their AVPlaybackUserInterface* counterparts (e.g., AVInterfaceMetadata → AVPlaybackUserInterfaceContentMetadata).
• AVPlaybackUserInterfaceContentMetadata and its VideoProperties nested type dropped hasAudio/hasLegible properties, and AVPlaybackUserInterfaceTimelineSegmentTypeMain was renamed to TypePrimary.

The playbackControl property on AVSystemRouteMediaSession has been narrowed from AVInterfaceControllable to AVPlaybackUserInterfaceControllable, which is a breaking type change for any code that assigns or casts this property against the old protocol.

BackgroundTasks APIs previously annotated as available on watchOS have been marked API_UNAVAILABLE(watchos), removing watchOS support across all task types, requests, and the scheduler.

Two initializers (initWithListItem: and initWithGridButtons:) moved from CPMapPanelItem to the new base class CPPanelItem, and CPTravelEstimates on CPMapPanelButtonConfiguration changed from nullable to nonnull.

Minor addition — a new init(_:) initializer on ComputeNodeGraph.Assembly.

CNContact.debugDescriptionForName(_:) has been removed.

A new kCGToneMappingHeadroomAdaptiveGainCurve case (value 6) has been added to CGToneMapping for headroom-adaptive HDR tone mapping.

New appleLog2 log transfer function constant added to CMFormatDescription.

Availability annotations corrected and unified across the framework — no new APIs or behavioral changes.

Minor additions — API availability annotations were added to CTQuickSwitchState and related declarations, restricting them to iOS 27.0 and marking them unavailable on macOS, tvOS, and watchOS.

The ChaChaPoly.open(inplace:using:nonce:tag:authenticating:) method has been removed with no replacement listed.

The DataDetector.Match memberwise initializer has been removed, breaking any code that constructs Match instances directly.

DiscoveryViewWrapper (a SwiftUI wrapper struct) has been removed from the public API with no replacement added.

New framework EnhancedLinkSecurity added, currently exposing only an import of the LinkSecurity module with no additional public API.

ContiguousBytes gains a new required method withBytes(_:), and two Data initializers (init(capacity:initializingWith:) and init(rawCapacity:initializingWith:)) have been removed.

The LanguageModelExecutorGenerationChannel executor SPI has been substantially redesigned: Event is now a concrete struct instead of a protocol, and all Action types have been converted from enums to structs with static factory methods, breaking any existing custom executor implementations.

• The AttachmentContent protocol has been removed and Attachment's generic constraint relaxed, so ImageAttachmentContent no longer requires the protocol conformance.
• GenerationOptions.SamplingMode.Kind renames nucleus→randomProbabilityThreshold and top→randomTopK, and Transcript.ResponseFormat gains a kind property with a schema case.
• LanguageModelSession.DynamicProfile removes inputFilter(_:) and toolCalling(_:), replacing them with onReasoning(perform:).

GCControllerHomeButtonSettingsManager has been redesigned to split the single home button action into separate system-action and in-app-action reads, with a new CustomizationStatus enum indicating whether a setting reflects a user override or the system default.

• The old readControllerHomeButtonAction() is removed and replaced by controllerHomeButtonSystemAction / controllerHomeButtonInAppAction properties (Swift) backed by new ObjC read methods that also return a GCControllerHomeButtonSettingCustomizationStatus out-parameter.
• The settings-change callback's type changed from a plain dispatch_block_t to a typed GCControllerHomeButtonSettingsDidChangeHandler block that receives the manager instance.
• The customization activity enum was renamed and its cases updated (e.g., customizeAction → customizeSystemAction, adding customizeInAppAction), so any existing switch statements over activity values will need updating.

GameKit no longer imports ReplayKit as part of its umbrella header, so apps that relied on ReplayKit symbols being transitively available through GameKit must now import ReplayKit directly.

Two IPTC Extension metadata keys for AI system attribution (kCGImagePropertyIPTCExtAISystemUsed and kCGImagePropertyIPTCExtAISystemVersionUsed) were removed before release.

New framework introducing LSLinkSecurityManager, a shared manager that lets apps register flagged URLs and asynchronously query whether a given URL has been flagged.

Several new provisional clusters are added, with the most significant being MTRBaseClusterAVAnalysis (AV context detection/tracking), MTRBaseClusterElectricalAlarm (electrical fault monitoring), MTRBaseClusterCommissioningProxy (proxied device commissioning), MTRBaseClusterAmbientSensingUnion, and MTRBaseClusterTemperatureControlledCabinetTopology.

• Device Energy Management gains provisional PowerRangeAdjustRequest/CancelPowerRangeAdjustRequest commands, a PowerRangeAdjustment attribute, and two new events (PowerRangeAdjustStart/End), alongside a new PowerRangeAdjustment feature flag.
• Several provisional APIs from the previous release had breaking struct/attribute renames (e.g., ObjectCountReached → ObjectCountThresholdReached, MTRDoorLockStatusCodeDUPLICATE → MTRDoorLockStatusCodeDuplicate, groupKeyMulticastPolicy removed from MTRGroupKeySetStruct) and property type changes (e.g., containerType in push AV transport events changed from nonnull to nullable).

The generic constraint on MediaDeviceRoutingManager.started(application:playbackControl:session:) tightened from requiring both AnyObject and AVInterfaceControllable to requiring only AVPlaybackUserInterfaceControllable, which may break existing callers passing types that don't conform to the new protocol.

Several MTLTensorDataType enum cases for sub-byte float formats were renamed (e.g., MTLTensorDataTypeFloat8E5M2 → MTLTensorDataTypeMetalFloat8E5M2), which is a breaking change for code using those types.

• MTLStoreActionOptions and all related render-encoder methods are deprecated as of OS 27, with the message that store action options have no effect on Apple Silicon.
• A new MTLFloatingPointConversionRoundingMode enum and corresponding MTLCompileOptions property let shaders specify rounding behavior for floating-point conversions.

Raw transmit and receive timestamps (as uint64_t) are now exposed on NIDLTDOAMeasurement, supplementing the existing double-typed timing properties.

New DTLS struct provides a configurable Datagram TLS protocol option (analogous to the existing TLS type) with full control over cipher suites, peer authentication, early data, and session tickets.

• NWProtocolTCP.Metadata.setMaxPacingRate(_:) was renamed to setMaximumPacingRateBytesPerSecond(_:), requiring call-site updates.

The extract(into:) method has been removed from both AnimatedArtwork and Artwork, with no replacement added.

New PHAssetExtendedMetadata class (iOS/macOS 27) exposes caption, original filename, and keywords on PHAsset, with corresponding write support added to PHAssetChangeRequest.

• PHAsset gains a playbackVariation property (autoloop, mirror, long exposure) and extendedMetadata; fetch options add prefetchAssetExtendedMetadata to eager-load it.
• PHImageRequestOptions adds a preferHDR property (back-ported availability to iOS 17/macOS 14).

Minor addition — the framework now imports ExtensionKit in addition to its existing dependencies.

CustomerEngagementSession.Error.networkError has been removed, requiring any switch statements or error-handling code that matched this case to be updated.

New acoustic material properties absorption and scattering let you configure how audio materials interact with sound in a scene, plus a new baseColorTexture debug visualization mode was added to ModelDebugOptionsComponent.

No functional API changes — only an internal header refactor replacing a direct import with a forward declaration.

New platformIdentifier property added to SecureElementCredential.CredentialSession.SecureElementInfo.

Minor addition — NSXPCConnection is now exposed within the StoreKit module.

DefaultHistoryUpdate.containsAttribute(_:) has been removed with no replacement indicated.

Several previously beta/preview APIs were removed and replaced with renamed or redesigned equivalents, most notably ToolbarMinimizeBehavior → ToolbarMinimizationBehavior (with a new companion ToolbarMinimizationRestoration type), and NewDocumentButton/NewDocumentButtonDataSource were removed entirely.

• Document read/write protocol methods are renamed (content: → snapshot:) and marked @concurrent, and FileWrapperDocumentWriter now receives the previous FileWrapper in its closure for incremental saves.
• Two new View modifiers, alert(error:actions:) and dismissalConfirmationDialog(_:shouldPresent:actions:), provide standard error-alerting and sheet-dismissal confirmation flows.

OnChangeValue is a new struct that packages the old value, new value, and a changed flag for onChange handlers, replacing the raw value approach; EnvironmentValues.textInputBorderShape has been removed.

InsightError has been refactored from a raw-value enum to a proper Error type (losing RawRepresentable) and gains Hashable conformance and errorDescription, while EvaluationError replaces evaluationResultSignatureInvalid with payloadSecurityError and also gains errorDescription.

• InsightEvaluation gains an eventID property.

New UIBarMinimization type consolidates navigation bar minimization behavior — replacing the earlier flat barMinimizeBehavior and barMinimizationSafeAreaAdjustment properties on UINavigationItem with a single navigationBarMinimization object that encapsulates minimize trigger, safe-area adjustment, and restoration behavior.

• UIBarAppearance gains an overrideUserInterfaceStyle property (iOS 27), allowing per-bar light/dark mode overrides without affecting the rest of the view hierarchy.

USDKit gains broad new authoring APIs for USD composition arcs and transform operations, but includes breaking changes: resetTransform(to:) is replaced by transform(at:) with a completely different signature (takes a TimeCode, returns USDValue.Matrix4d?), and ReferenceCollection.add(_:) now takes a USDPrim.Reference instead of a USDLayer.AssetPath.

• New collection types (InheritCollection, PayloadCollection, SpecializeCollection, VariantSet, VariantSetCollection) expose full add/remove/set/clear authoring for all USD composition arc types, accessible via new USDPrim properties (inherits, payloads, specializes, variantSets).
• USDTransformOperation is significantly expanded with per-axis rotate/translate/scale kinds, a new Precision enum (half/float/double), time-sampled transform queries, and a new init(attribute:inverted:) constructor.
• USDPrim.ListPosition has dropped its RawRepresentable and CaseIterable conformances, which is a breaking change for any code that iterated cases or used raw values.

The generateIterativeSegmentation result case now accepts a nullable PixelBufferObservation (was non-optional), which is a source-breaking change for existing switch exhaustive matches or direct construction.

• DownloadableAssetsRequestStatus.downloading is a new status case for tracking asset download progress.
• GenerateIterativeSegmentationRequest.allSupportedRevisions has been removed.

WKWebpagePreferences gains a globalPrivacyControlEnabled property (iOS 27) letting apps signal the Global Privacy Control preference to web content, and a Swift label rename on WKContentWorld.worldWithConfiguration: changes the call site from world(with:) to world(configuration:).