Robin, Batman's tight wearing sidekick, may be a playable character in Batman: Arkham City. An eagle-eyed reader on arkhamcity.co.uk noticed a Best Buy ad promoting Robin as a pre-order bonus. There has been no confirmation on what the pre-order bonus actually is but RockSteady confirmed we'd get more details soon via their twitter.
"For those of you with burning questions about the recent Robin/Best Buy announcement stay tuned as we will be revealing more details soon!"
Whenever "soon" is you can be sure we'll update you.
If Robin is a playable character he will most likely be exclusive to a particular game mode. Batman: Arkham Asylum had a Joker Challenge Rooms exclusive to PS3 copies so it's possible we'll see something similar. What do you think?