Take-Two Interactive announced today that BioShock 2 was officially in the works, under the development wing of the recently formed 2K Marin studio. The sequel—rumored to actually be a prequel—to the Xbox 360 and PC shooter is planned for a fourth-quarter fiscal 2009 release date. Take-Two's fiscal year matches the calendar year, so expect it to hit unspecified platforms (read: Xbox 360) before the '09 holidays.
Take-Two also noted that the original BioShock has 2 million unit sales under its belt since its August '07 release. No pressure, 2K Marin! No pressure at all.