BioShock 2 studio 2K Marin is already hard at work on a new game, 2K president Christoph Hartmann has told 1UP.
"I know they're working already... We already have plans, and have worked far beyond the conceptual stage for a follow-up project after BioShock 2," said Hartmann when asked if 2K Marin was going to end up as 'the BioShock studio.'
"What that is, I can't announce; I can't tell you obviously. But so far, they've completely exceeded my expectations."
BioShock 2 is still in development. The game was pushed into the first half of 2010 in July, back from a November release.
There's a full interview through there.