You can uninstall apps now from the iOS inspired Launchpad.
The built in document system "Versions" got a Time Machine like animation.
|sadly all screen capture apps i tried failed to record this|
The most criticized interface change, the sliding toolbars are reverted to Snow Leopard style.
French blog Consomac.fr found hints in the source code that MobileMe gets an upgrade called "Castle", guess we see a brand new MobileMe soon.