Core Changes

• feat: using @next/rspack-core: #84221
• Upgrade React from ead92181-20251010 to d7215b49-20251013: #84850
• Turbopack build: Switch to using workerthreads for process: #84818
• [Cache Components] Dev - restart render on cache miss: #84088
• Update font data: #84785
• Fix build compile mode if pages dir does not exist in Next.js 16: #84783
• improve next config schema validation errors: #84847
• Upgrade React from d7215b49-20251013 to 56e84692-20251014: #84860
• warnOnce for Middleware deprecation: #84862
• Add codemod for Middleware API to Proxy API: #84824
• Deprecate Middleware API and add Proxy API: #84764
• remove clientParamParsing configuration & bundle it with cacheComponents: #84763
• remove dynamicIO flag: #84872
• Bump eslint-plugin-react to 7.37.0: #84876

Misc Changes

• docs: soft 404's, Suspense and loading.tsx: #83867
• [turbopack] Discuss Core Web vitals in our bundle size gap docs: #84837
• [turbopack] document missing webpack loader features: #84849
• [turbopack] fix typo in docs: #84868
• [turbopack] Remove the implementation of TaskInput from AutoSet: #84867

Credits

Huge thanks to @SyMind, @icyJoseph, @timneutkens, @lubieowoce, @vercel-release-bot, @greguintow, @huozhi, @devjiwonchoi, @lukesandberg, and @ztanner for helping!