Well, its not quite ready. But there are a lot of new features (mostly code) for this build. I am hoping by releasing most of it early, some of the annoying bugs that pop up on day one can be taken care of now.
The biggest new features:
ScheduledEvents: Simple API for scheduling a recurring event (or once a day event). Examples would be clearing the stats queue or rebuilding the search index.
EntryHanlders: Ability to configure "extra" processing of entries (posts, comments, articles, trackbacks) before and after they are saved to the data store. These can be used to validate an entry for unwanted/ill-formed html, emailing comments, or even transforming text to images.