Is Robin Coming To Batman: Arkham City’s Challenge Rooms?

I'm inclined to just go ahead and trust Rocksteady on this one. Still, I'm surprised to hear this rumor, all but confirmed by Best Buy's product listing for Batman: Arkham City.

Possibly the best fansite I've seen, Arkhamcity.co.uk captured the image below for anyone considering where to leave $5 behind. Best Buy's online product listing for Arkham City listed a playable Robin skin as a bonus. The skin is reportedly only available for use in the game's challenge maps, but it's playable Robin nonetheless.

If you haven't already put money down on Arkham City, I doubt you'll find a better incentive. Regardless, I hope that WB Games follow the trend they set with Mortal Kombat and offer all preorder DLC as a bundle after release.

[Source]