It is how AMD's APUs work, though. Nothing's out of possibility, though it's certainly doubtful they'd do that (power draw for a start). Like I've said before, the only specification we have is from the August 2012 dev kits. They'll likely have gone through a few iterations since then.|
I think MS is waiting until April as that's when they'll have a hardware sample to show. They're literally waiting til they can show a finished machine, right there, and play games off of it. That could backfire, natch, if it crashes like a lot of similar MS reveals have, but it's one way they can guarantee the spotlight.