It's basically 2009 re-packaged with Toxic and Matchmover. Maya itself, aside from some small bug fixes, is exactly the same as 2009 unlimited. As Jay mentioned, the folks benefiting the most from this are the freelancers who get a nice suite of software, as well as the dynamics that were previously only available to folks using Unlimited. For any noticeable updates/changes, you'll have to wait until 2011, unless ADSK decides to release an enhanced service pack to 2010.
"Terminat Bora Diem, Terminal Auctor opus."