-- silent preloading of games you may be interested in
-- immediate local play of digital titles while they download
-- OnLive/Gaikai style video streaming of full disc games you haven't yet purchased
-- rolling video replay of your screen as a core system service
-- Mobile-style instant system hibernation
-- continuously streaming your display to remote friends
-- allowing remote friends to assume control over your currently playing game
All of these are welcome, but "play the full game as a streamed demo" and "preload digital games of likely interest" are brilliant, wiping out so many pain points from digital software purchasing.
(and back to cynicism: every game they showed off was pre-rendered nonsense, their target market is plateauing at best, mobile's strangling them, etc etc etc)