According to this new post on the Zend Developer Zone (from Wil Sinclair) the latest Release Candidate for the upcoming Zend Framework 1.6 release has been posted - Release Candidate 1.

We couldn't be happier to announce that Zend Framework 1.6 Release Candidate 1 is now available from the Zend Framework download site!

New features include the major Dojo integration, SOAP components and updates to the functionality for unit testing, session handling, pagination, character sets and much more. Check out the full list in the Zend Developer Zone post.