The revelation that Batman: Arkham City's one-use code unlocks the entirety of Catwoman gameplay in the game's main campaign set back quite a few gamers looking to rent the game or buy used. GameStop feels your pain.
An internal memo verified with GameStop locations tells its retail staff that used copies of Batman: Arkham City should be paired with a code for Catwoman content printed on the receipt. All of this seems fairly counteractive to the online pass code itself, but GameStop is a huge corporation with some pretty strong ties with publishers.
We'll bring you more details as they become available. How many used copies of Batman: Arkham City will there be on shelves if the game isn't even out yet?
[Source]