Following the November 6 release date reveal, Halo 4 made its much-publicized appearance on Conan O'Brien's TBS talk show Conan in a nine-minute sketch which may or may not confirm that the show's host and his longtime creative partner Andy Richter will be lending their voices to the game. One thing is certain though: there's a few seconds of multiplayer footage near the end.
Watch the video and you'll see why it's not clear if O'Brien and Richter really are involved (obviously the scene that they're recording for is a fake). That's the problem with comedy. You never know when it's being serious. We're checking with Microsoft just to be sure of what the facts are here. In the meantime, watch the video. It's funny, and it ends with a few seconds of Halo 4 multiplayer footage. Nothing wrong with either of those things.