2K Boston's Ken Levine has been talking to the media about the possibility of downloadable content for Bioshock, the spiritual sequel to the classic system shock 2..

Thankfully, he suggests that he does not want to add to the narrative of the game, but rather focus on replayability through adding extra plasmids and tonics.

He references Diablo II as an influence for any possible modes of expansion to the game, so it is worth reading what he says over at 1up.com