Batman: Arkham Asylum devs working on Hitman 5?
Agent 47 is coming back. That was confirmed by Eidos president Ian Livingstone a few months back. Back then, Livingstone mentioned that IO Interactive was working on the game, but that may no longer be the case.
According to the resume of actor Mark Sloan, one of the game's mo-cap actors, the studio attached to Hitman 5 is Batman: Arkham Asylum (PS3, Xbox 360, PC) dev Rocksteady Studios, not IO. Perhaps IO is busy working on the Kane & Lynch sequel along with Mini Ninjas.
Another thing of note is that Sloan apparently completed his mo-cap duties for Hitman 5 back in 2008, so it might not be too long before we hear something official about it.