There is support for running Windows apps natively within the OSX desktop, with the new version of Internet Explorer happily co-existing alongside an OSX Finder window. Speaking of which, Finder now has tabs. Thank goodness for that.
There is new support for virtual desktops, which allow users to switch between different layouts for different tasks or aspects of their machine. A transition appears to show the user ‘peeling away’ the top layer of the current desktop to get to another one underneath.