Run on over to www.joomla.org/announcements/release-news/5546-joomla-3-3-0-released.html, and you'll see the latest version of Joomla has been released.
After a brief run through it would seem that although there are some really nice headline features such as a shift to JQuery and a greater focus on Microdata; this release is more a case of releasing code in to the core rather than usable functionality.