ROFL, the game has only been out 2 days and they've already announced DLC.
Today Ubisoft announced that Assassin’s Creed Revelations will feature downloadable content following the game’s release, starting with The Ancestors Character Pack in December. The first new downloadable content features four new multiplayer characters: the swashbuckling Privateer, the devious siren Corsair, the battle-tested Brigand and the bloodthirsty Gladiator. Each character is personalized with unique taunts, weapons and stylized assassination moves.
The Ancestors Character Pack will be available for download on December 13, 2011 on XBOX LIVE® and December 14, 2011 on the PlayStation®Network. The DLC will be made available for 320 Microsoft points or Ł3.19.