Liveblogging the Microsoft keynote address from the Tokyo Games Show in Japan, Major Nelson says that Microsoft has shown the announcement trailer for Bungie's next Halo game. It's a prologue to Halo 3 called Halo 3: Recon, and as the rumor mill has long anticipated, it is a story told from the perspective of ODST marines.

Head over to Bungie.net for the announcement trailer.

UPDATE: The game is expected out in Fall of 2009, little more than a year away. That might be less time than some expected, and more than others did. The "Halo 3" moniker on the game, as well as the "new campaign" tag in the trailer indicates this uses the Halo 3 engine, although there's no way to tell yet whether this will be extensive DLC or a new boxed title. The trailer itself runs quickly through most of the content in the teaser trailer, then shows an ODST that survived the drop and the explosion and is now being hunted by Brutes dropped off by a Phantom.