When I first heard the pitch for Will's new company I thought it was kind of dumb. But after see this demo, it's possibly one of the more compelling things I've seen from both streams. Both the "show" aspect would be neat; I would totally watch a show similar to the Campo interview once a week or something. Then the whole aspect of just hanging out with someone in a set, be it a game environment, or just a regular set, looks really neat.
EDIT: This is a WHOLE different thing, but it would be neat if they would someday be able to walk through "scenes" of a game or something. Having a game director give commentary on a big game set-piece, with the ability to pause/rewind, would be amazing.