Core Changes

• feat(next/image)!: deprecate and warn on images.domains config: #84625
• feat(next/legacy/image)!: deprecate and warn on next/legacy/image usage: #84622
• Turbopack: improve errors/warnings for turbopack messages: #84552
• Turbopack: rename turbopackPersistentCachingForXXX to turbopackFileSystemCacheForXXX: #84632
• [Segment Cache] Add refresh URL to reused default segments: #84627
• [Segment Cache] Fix tests related to optimistic loading state reuse: #84498
• Upgrade React from a4eb2dfa-20251006 to 3025aa39-20251007: #84613
• [breaking]: enable clientSegmentCache by default: #84643
• feat: Acquire a lockfile on distDir in next dev and next build: #84428
• Add deprecation warning to Runtime config: #84168

Misc Changes

• [create-next-app]: prompt to use recommended options: #84570
• Update labeler: #84623
• Turbopack: use mmap advise to help the OS preloading: #84379
• Turbopack: skip invalidating a task on cell/output change when the dependency is outdated: #84551
• Turbopack: follow-up changes from untracked tracing: #84629
• Turbopack: sourcemaps for JSON modules: #84611
• Turbopack: avoid race condition when updating cells: #84598

Credits

Huge thanks to @ztanner, @samselikoff, @styfle, @sokra, @mischnic, @acdlite, @bgw, and @devjiwonchoi for helping!