2K Boston creative director Ken Levine has said in passing that his next game is vastly more ambitious than BioShock, although we still don't know what it is.
"We needed a certain kind of length for the title, because we had a scope and ambition in mind which is more ambitious than anything we've ever done," Levine told Gamasutra in an interesting interview about hiring practices.
"Even more, substantially more ambitious than BioShock. And we knew that was not going to happen overnight."
He also points out that the pre-production process has been "very long". "If you go back and look at our ads and stuff, we've been recruiting for how many years now? For this product? A couple of years?"
Levine, who is not contributing to BioShock 2, has yet to tell anyone what he's working on, although he wouldn't confirm or deny suggestions that it's a new X-Com title when he spoke to GameSpot earlier in the year.
Elsewhere in the Gama interview, Levine explains how 2K Boston quizzes applicants about storytelling and how art works on people, among other things, and discusses his fascination with antagonists and, of course, Ayn Rand.