so my guess is since bungie said they were not making any more halo games this will be either and expansion, OR a new game in the halo universe, maybe a game about ODST (orbital drop shock troopers) like the ones you fight along side in #2 and #3, the black dudes that look like spartans.
"Holy shit!" - Seriously mark out for pretty much anything Halo and that vid, as short and cryptic as it was, was yet another great peice of viral from Bungie.
Can't wait, hoping this is a new full on camapign thing in the style of the old Half-Life ones (like Blue Shift, etc.). It'd be cool to be playing as someone else in the Halo universe during the story of the third game, IMO. Has so much potential.