The first Komodo 5.1.0 alpha build has been released and it's now available for download:
http://downloads.activestate.com/Komodo/releases/5.1.0a1/
The PDF documentation has been updated, you can grab it here:
http://community.activestate.com/faq/komodo-documentation-in-p
For a full set of release notes and Komodo 5.1 documentation, see the online pages:
http://docs.activestate.com/komodo/5.1/releases/ide.html#bug_fixes-5.1.0...
Cheers,
Todd