Bioshock Infinite takes place in the floating sky city of Columbia, as opposed to the previous games in the underwater city of Rapture. The story centers around the character of Booker DeWitt, a former Pinkerton agent who is tasked with rescuing a young woman by the name of Elizabeth from the collapsing city of Columbia in 1912. Booker must use his wits, guns and new abilities such as Vigors to save Elizabeth from the Vox Populi ( a group of rebels who've had enough with the lies of the elected officials of Columbia), and the Songbird, Elizabeth's birdlike steampunk guardian.
e3 2011 demo:
Pax Prime 2011 Interview with Adam Sessler, Ken Levine, Coutnee Draper, and Troy Baker