The Double XP just keeps on coming doesn't it? This week's Halo 3 flavor playlist is known as Legendary Brawl and is a ranked free-for-all playlist that requires the new Legendary Map Pack. While that is a bit unfortunate, most out there bought this pack now that the first one is now free (basically six maps for $10). Since the playlist is both ranked and every man for himself, Bungie notes that it'll be a good opportunity to finish off your achievements. The twelve man games are online now, and will be until 2am Pacific time on Monday.
[Thanks to everyone who sent this in!]