Looks like the preview build of ADT21 is out there.

Android-er: Preview build of ADT 21 and of the SDK Tools, r21 …: Preview 1 is mostly a bugfix release. It contains a number of bug fixes in various areas that were new in ADT 20, such as the new templa…

ADT20 was a nice jump in terms of functionality.  Since I work on both Android and iOS, while I enjoy the Eclipse environment more, there are some things that XCode does a better job at.  UI development and templates come to mind the most.  I’d love to see a Storyboard-esque feature in ADT, which would greatly improve the creation of UI’s.

The project templates are great to help get going faster, especially as the project structures get more complicated with things like Fragments.  Having previously built a fragment UI by hand, having the IDE create the initial template would have made it much easier.  I’m also hopeful that project templates will help encourage developers to follow more of the Android standards.