While you'll find a few additions in the areas of change and activity reporting, this is primarily an incremental update release. The WYSIWYG editor library has been updated to the latest version which includes numerous bug fixes. Various display glitches, especially those showing up on IE7 and IE8, have been fixed. And there are a whole host of other fixes and enhancements. See the changes page for full details.
As always, thanks to everyone who tried the beta releases or otherwise reported problems to us!