The only thing I can say is... if the Durango was changed than how much? And when? Because to be released in November of this year Microsoft need to start the mass production of all the components at least six months before the release ( ~June).
At this time for a release in late 2013 both Sony and Microsft already closed the final specs.
I can't see any company making a desperate change in project just to be a little more powerful.







