Microsoft has just announced Halo 4, which is to be "a beginning of a new trilogy"! Check out the trailer below and stay tuned for more details:
Looks like we won't be able to play it for a while, though - the game is slated for the end of 2012. Hopefully before the end of the world.
Don't forget to check out our Halo Wiki too for all you need to know about the Halo series!