This is a quote from the kotaku site concering this supposed game:
"I received an email tonight from one of the guys behind the whole Sunder game for the Revolution. Sunder, it turns out, is both a fake and not a fake. It’s a fake in the sense that it’s not actually an approved Revolution game, but it’s not a fake in the sense that it is a concept for a game that the developers hope to one day get on a Revolution.
The game is being created by a company called LifeSpark Studios which was started by Derek Sarbou and Kenton Bailey. Sunder, and these “leaks”, were apparently there way of pitching the game."
See the full story at the link below: