The Next.js 3.0 beta release introduces several features, including `next export`, which allows for seamless building of a standalone static website from a Next.js app without the need for a server. This feature enables deployment of the app directly to platforms like Vercel with minimal configuration. The new `next export` subcommand supports dynamic imports and preloading, making it easier to manage code splitting and improve performance. Additionally, Next.js 3.0 includes support for TC39 dynamic imports, which enable fetching modules dynamically as a Promise, allowing for more granularity in code splitting. Server-side rendering is also improved with the ability to render dynamic imports synchronously, avoiding blank pages or loading spinners. The new version is backwards-compatible and ready for experimentation and pre-production use, with updated documentation available.