Productivity, Performance, Stability, there are no major breaking changes (see the changelog) — but a lot of behind-the-scenes improvements. Your apps will get slightly smaller and faster (even relative to 2.0 which already made huge strides in size and performance since the compiled-from-TypeScript days).
On the Dart Developer Summit, we launched AngularDart Components — the material design widgets Google is using in customer-facing apps like AdWords and AdSense. Hundreds of Google engineers work with these components every day.
<material-dialog>, a customizable modal window created with the material design principles.
Note: the open source AngularDart Components do not currently accept pull requests. They will in the future, and we do follow GitHub issues, of course.
We hope AngularDart 2.1 and AngularDart Components will serve you well. Let us know what you think!