I have had more than a taste of what true next generation gaming is going to have to offer and I'm here to tell you -
You're in for something special.
I can't speak much for Sony right now - yeah, we're working on stuff for the PS3 but honestly I'm so busy with Gears that it's all I'm seeing and I can tell you - MS is giving you a hell of a system. This thing is a BEAST and is capable of MUCH GREATNESS.
Sigh. That's all I can say so far. I am, after all, under NDA.