As of this writing, Catalyst version 5.8000_01 has been released to CPAN, although by now there may be a new version. You can check out this preview release at:
or if there has been any updates you can spot that in the version list.
Pretty soon we won't be calling this Catamoose, it will be just plain old Catalyst. Definitely you should be testing this in your application builds, starting immediately.
This version strives for backward compatibility. Let's get it settled down fast so we all can starting tearing down the code and creating Catalyst 6.0!