According to Ubisoft, there's a DLC pack for Scott Pilgrim vs. the World on its way. It should be out in November and will include the new playable character Knives Chau and two new playmodes - one where we get to play dodgeball (virtual bullying?) and one arena mode where we get to fight each other. Some general improvements to the game is also to be expected, with some jump in and out co-op included.