TSS:
The release of the long-awaited 2.1 version of Cocoon on August 13th marks the transition from a publishing-oriented XML/XSLT server engine towards a componentized XML-based web application development framework.
The Cocoon news page has a little more information. Keep an eye on Matthew Langham‘s blog, as he might have some more info in the near future. Also be sure to be glued to the Cocoon Dev Blogs.