A teaser trailer was released not long ago, but this is the complete trailer, continuing to show more CG cutscenes after the teaser ended. Officially titled Halo 3: Recon, the game will feature a new hero by way of a UNSC Recon Marine. The game will feature a new campaign, maps, etc. I'm a bit torn on the idea of a side-story featuring a character that isn't Master Chief and one who is supposed to do recon work on the Covenant, but I'll give Bungie the benefit of the doubt for now.