The Next.js plugin system on Netlify allows developers to manage native support with added control, visibility, and the ability to test new functionality before its release. A new version of the Essential Next.js plugin is available in beta, featuring improved support for routes, redirects, headers, monorepos, custom project types, and On-demand Builders with persistent rendering. This update also includes reduced resource usage and faster build times. The latest version can be installed by following three steps, and developers are encouraged to test it on a staging environment or side project and provide feedback.