Hah! "Told you so!" the stronger version goes exactly as I predicted about year ago!
So now, going further with predictions.
The weaker one will be ARM based, I'm telling you!
The push to ARM is strong and clearly visible, this would be ultimate test drive for next-gen where it'll be ARM-only (when they catch up with performance)
Look, it's kinect-like so they won't have to care for cross-compatibility since kinect-games create totally different experience so you wouldn't want to have same games (experience wise, titles will probably overlap on both) on two different products. Right?
+ Recent rumors of Kinect like devices for Windows 8 which will run on both arm and x86!
It all makes sense!