He's a "timed exclusive" as well as retail only for now. Other reveals include Catwoman, Two Face, Calendar Man, Penguin and Hugo Strange.
"We've made announcements about Robin being a retail exclusive, a timed exclusive," said marketing manager Dax Ginn. "We've got more announcements coming." A new trailer for Arkham City from Rocksteady has been announced for ComicCon.
"We're big Batman fans," he added. "I know there are a lot of gamers out there who are also hardcore Batman fans, we get that every day from the community."
"We love what we're doing, we're really focussed on October. I think this game is really going to satisfy the dreams people have had for a Batman game for a long time."
What other Batman characters would you love to see in Arkham City? We can play as Catwoman during the game as she plays a central role. Batman: Arkham City releases on Xbox 360, PS3 and PC October 18th in the US, 21st in Europe.