Halo 4 has been confirmed via Microsoft's own E3 hub on Xbox.com. The page features an image with the headline, "Return to the Halo Universe," followed by "The news millions of Halo fans have waited for: Halo 4 is on the way. But that's not all...".
No other Halo 4 information is on the site, but other games are revealed and confirmed. Ryse, a cinematic, action-packed Kinect experience, could well be Crytek's Codename Kingdoms, while Kinect Star Wars, Dance Central 2, Halo: Combat Evolved Anniversary and Kinect Sports Season 2 are all pretty much known about at this point.
Kinect Fun Labs, a collection of gadgets for Kinect, is also revealed, along with new voice search coming to Xbox LIVE.