"All things Halo"
[Update: Trailer now included.]
At Microsoft's press conference, right after talking a bit about the upcoming Halo: The Master Chief Collection, 343 took the stage to reveal The Halo Channel. It's for watching "all things Halo," including shows, streams, and recorded play. It's like Mario Kart TV. Kind of.
A partnership with Twitch for the channel was also announced.