ejabberd 2.0.0 has been in the works since more than a year ago. This release will include an impressive amount of new features, improvements and bug fixes. Just to name two: more clustering features and updated Pub-Sub service with PEP support.
Please read with detail the Release Notes for a list of changes and important notes.
But the final release of ejabberd 2.0.0 is not ready yet. Right now it's time for Release Candidate 1.
Three weeks ago 2.0.0-beta1 was published. Several people reported important bugs that are now fixed in RC1. You can check the tickets concerning Beta1 that are fixed in RC1 and the SVN log since Beta1 was released until RC1.
Source code and binary installers are available as usual in the ejabberd downloads page.
To formally report bugs please use the ejabberd bug tracker. Alternatively, you can start a discussion in the ejabberd mailing list or in the ejabberd forums. If you just want to report a small bug, you can also add a comment here.