It was finally confirmed after a lot of rumours that a new X-com title, called XCOM is in development at 2K Marin. But something that could quite possibly be another title kept under wraps at 2K is a BioShock MMO.
This apparently isn’t the first time that this rumour has cropped up, and 2K has reportedly suggested in the past that they might have plans to do just this. About two years ago, in March 2008, it was said by the boss of Take-Two, Strauss Zelnick, that it was a potential possibility.
As for a particular studio working on the project, rumours have it that it’s 2K Marin, but remember that 2K Marin is working on XCOM, or at least the Australian branch is, mainly [complicated, I know].
It’s kind of funny though, when I think about it, a BioShock MMO could just work.
Source: Rumor: BioShock MMO in the works [Destructoid]