Usually the go-to late-night personality has been Jimmy Fallon for showing off a game, with the most recent being The Legend of Zelda: Skyward Sword appearing on his show. But Microsoft picked a different way to go, because they're rebels, man. Or maybe they like good comedy, I have no idea. Anyway, word has it that 343 Industries and Microsoft will have some sort of Halo 4 news or announcement tonight on Conan.
Jessica Shea (Community Manager at 343) confirmed on her Twitter yesterday that "Halo 4 news" is "incoming." I have no idea what that means, but I'm all over everything Halo or Conan O'Brien. There's no sense in speculating, because it could honestly be absolutely anything at this point. Be sure to watch Conan at 11:00 PM EDT to catch whatever it is. You should really be watching it anyway, but if you can't catch the show we'll have you covered.