That Videogame Blog points out that concept artist Ben Mauro recently put up a nice collection of concept images for a "proposed sequel to BioShock.
Mauro told the site that these are just personal images he created for an art class he was taking. The assignment, he says, was to design a sequel for a video game or movie.
Too bad, because it's some pretty amazing stuff. I liked it so much I sent a link to Ken Levine to see what he thought. Haven't heard back yet.
It almost looks as if Mauro was thinking prequel when he did this art. Perhaps this shows the making of Rapture? Check out the link for images of his tram system.