The next-generation successor to the Xbox 360 will sport a dual GPU setup, a "four to six" core CPU, built-in Kinect, always-on Internet (to combat piracy), and a Blu-ray drive, numerous unnamed sources have revealed to VG247. The same sources note that the details come straight from Microsoft as it meets with third-parties in advance of the console's release, which is currently targeted for Christmas 2013.
Microsoft is already on record as saying that there won't be any talk "of new Xbox hardware at E3 2012 or anytime soon," from a March 15 statement. That doesn't mean work isn't well underway on whatever hardware will be following the Xbox 360. The lack of reveal doesn't mean that development on the next-gen MS console isn't already well underway. In fact, you can pretty much count on it. Whether or not the specs detailed above are accurate is another matter entirely.