Exactly what BioShock 4 will look like is unclear. It's likely that many of the gameplay mechanics of previous BioShock entries will make a return, and the game's narrative, game structure, and world-building will probably retain some of the original flavor as well. That said, it's been over a decade since the last BioShock, and changes should be made to a number of the series' staple characteristics, including its philosophical backdrop.