Angular v21 is released, offering new tools and enhancements for developers, aligning with an AI and adventure theme. It introduces experimental Signal Forms for scalable, reactive form management with built-in validation. Angular Aria is now in developer preview, providing unstyled, accessible UI components for custom styling. The MCP server for AI agents is stable, offering tools to access Angular context and features. Vitest is now the default, stable test runner, replacing Karma for new applications. New Angular applications no longer include zone.js by default, promoting zoneless change detection for improved performance. The documentation site, angular.dev, has been updated with new content and tutorials, including a dedicated section for AI development. Significant improvements have been made to guides on routing, dependency injection, theming, and Tailwind CSS integration. The Signal Forms API is experimental and welcomes developer feedback for iteration. Angular Aria aims to empower developers to build accessible, styled UI components.