Of course, while I'm there, I must develop a game on it in my spare time. Preferably something multiplayer, so I can get everyone else with an XDK playing it. I'm tempted to do a Mario clone, just because it'd be funny (and I can handle the art for it).
I guess the alternative is something using Rebellion's own engine tech, which would be a good way for me to learn the engine, but I don't know the art pipeline (at all).
And then get approval to release it as an official XBox game.