A Microsoft VP has confirmed that the company is already in the planning stages for a next-next-gen follow up to the Xbox 360.

The "Xbox 720" looms on the horizon
Saying that "You can't sit back on your laurels in this business,"Microsoft EMEA (European, Middle East, and Africa) vice president ChrisLewis told Kikizo that the company is hard at work designing a new next-gen console.
Lewis is surprisingly direct about Microsoft's plans for a next-genconsole. "The consumer won't let you [rest on your laurels], thedevelopers certainly won't let us. So that's happening right now," hesaid.
"You'll see more [on a new Xbox] over time...certainly we're nottalking about the next version yet," Lewis told Kikizo, "so give us achance to catch a breath, will you?"