Batman: Arkham City resides a code for an online VIP pass, which grants access to Catwoman content. If you pick up the game used, there's an option to purchase the VIP pass for 800 MS Points ($10) on Xbox Live and $9.99 on PSN. But have no fear if you're trying to save a few bucks and want to pick it up used: "Playing as Catwoman is not required to complete the game," a Warner Bros. rep told Eurogamer.
Catwoman is just one of the playable characters on offer in Arkham City. Two different DLC packs will also unlock Robin and Nightwing (who is also Robin) for play in the game. Then, of course, there's the fifty different skins for Batman that can be purchased. So rest assured: if you're really against the vanilla Batman, you can purchase the right outfit that fits your needs.