What’s stable and production-ready:

• Angular’s MCP Server, now with more tools — allowing LLMs to use new Angular features from day one. The most interesting feature is the onpush_zoneless_migration tool. It can analyze your code and provide a plan to migrate your application to OnPush and zoneless change detection.
• The Angular CLI now uses Vitest as the default test runner. And there’s an experimental migration if you want to migrate your old Jasmine tests: ng g @schematics/angular:refactor-jasmine-vitest
• Creating a brand new Angular application with the CLI no longer includes zone.js.

What’s experimental or in developer preview, not recommended for production:

• Signal Forms, providing a new composable and reactive forms experience built on Signals. Here is my short tutorial about the basics of Signal Forms.
• Angular Aria is launching in Developer Preview, providing headless components built with accessibility as a priority. To install: npm install @angular/aria. It is starting with 8 components:
  • Accordion
  • Combobox
  • Grid
  • Listbox
  • Menu
  • Tabs
  • Toolbar
  • Tree

You can read more with the official v21 blog post here. I will unpack all these new features over the next few weeks in separate posts.