
Very little is known about the sequel to Batman: Arkham Asylum, other than Rocksteady are developing it and Harley Quinn and the Joker are coming back to give the Dark Knight a hard time. One thing is certain, Bat fans around the globe are speculating at who else will make an appearance in Arkham this time around. After all there are plenty of famous villains and heroes to choose from.
Well, if you ask IMDB they will tell you that Robin will be in Arkham Asylum II, as a voice actor has already been cast. Vincent Marbella (Everybody Hates Chris) is the voice of Robin apparently, but when asked about this info, Warner said: "To our knowledge, what you asked about is inaccurate information. We are not yet discussing details for the sequel."
Of course, IMDB is not always accurate, but they don't make this stuff up out of thin air (well, they did once list Scott Baio and Joan Rivers for Season 7 of Buffy - Ed). If it does turn out to be true, then we can no doubt expect co-op play. Let's hope they don't look to Chris O'Donnell for Robin inspiration...
IMDB also have Bruce Greenwood (Star Trek, National Treasure 2) listed as the voice of Two-Face. Check out the current cast list here.