Rumor: Bioshock 4 May Be In The Works, Says Source
"BioShock Infinite is scheduled to arrive on Xbox 360 on February 23, 2013. But could 2K Games be planning the next title in the series, BioShock 4? A inside source has told us that this may in fact be true."
(BioShock, BioShock 4, PC, PS3, Xbox 360)