now imagine this at the gui level. imagine being on your mac, pick up your ipad, move to the next room, and swipe and have access to the same apps currently running. jut look at what apples been putting out the last few years. look at lions big features. full screen mode doesnt sound impressive. but that would make those apps much easier to use on the ipad.
im nut saying this is all new stuff, rather, its going to be packaged by apple, and that is going to mean something.