We just updated the SDK and the documentation.

http://docs.sencha.io/0.7.5/index.html

http://download.sencha.io/sencha-io-0.7.5.zip

This update includes support for all versions of Sencha Touch from 2.0 through to 2.1, and also Sencha Cmd.

The release notes includes the list of changes since the last release:
http://docs.sencha.io/0.7.5/index.ht.../release_notes

Post to the forum, or email support@sencha.io, if you experience any problems.