This RFC (Request for Comment) outlines the biggest update to Next.js since it was introduced in 2016:

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Nested Layouts: Build complex applications with nested routes.
Designed for Server Components: Optimized for subtree navigation.
Improved Data Fetching: Fetch in layouts while avoiding waterfalls.
Using React 18 Features: Streaming, Transitions, and Suspense.
Client and Server Routing: Server-centric routing with SPA-like behavior.
100% incrementally adoptable: No breaking changes so you can adopt gradually.
Advanced Routing Patterns: Parallel routes, intercepting routes, and more.

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The new Next.js router will be built on top of the