Bungie has announced the third and final map in the upcoming Downloadable content pack for Halo 3, the Legendary Map Pack. Blackout is a remake of the Halo 2 favourite Lockout, and it is supposed to be a strict remake of it without too much changes made. There is more information on Bungie's site, while the first images are available here.
@Melmoth: I definitely disagree and agree at the same time. I've been saying that OW has a fighting game aesthetic for a while, but I feel like they come from different places artistically. (13 Hours ago)