Turbopack: High-performance bundler for React & TypeScript

Introduces Turbopack, a new Rust-based bundler designed to replace Webpack. Highlights its incremental architecture, caching mechanisms (leveraging Turbo), and significant performance improvements in development server startup times and update speeds (700x faster on large apps). Mentions native support for React Server Components and TypeScript. Outlines future plans for production builds and team cache sharing via Vercel Remote Caching, along with an incremental migration path for Webpack users.