After sales of brainy first-person shooter BioShock were so strong, a sequel seemed like all but a foregone conclusion. 2K Games put any remaining doubt to bed today, revealing that BioShock 2 is due to hit shelves in the fourth fiscal quarter of 2009, which would put it between August and October of 2009. The game is being developed not by Ken Levine's 2K Boston, but rather 2K Marin, which reportedly has some BioShock staffers on board. At this point, we don't know what (if any) involvement Levine will have, nor do we know what systems it will be on.

The info came in an investor relations report released by the company today. Even though we figured the game was in the works, we have to admit we're a little surprised by the window, just two years after its predecessor. But you're not going to hear us complaining. If it means more Big Daddies and Little Sisters, we don't really care where we get it.

This article was originally published on Joystiq.