Gamespot's posted up a hands-on with the PS3 version of BioShock, out on October 24. Snip:
Outside of the proper single-player experience, we had a chance to try the Survivor mode, which offers a greater level of challenge that forces you to be smarter about how you play the game. Enemy behavior has been tweaked, and the damage you cause has been modified, so you won't be sailing through the mode even if you're familiar with the original game.
There are three new movies after the break, including footage of the new Survivor mode and Trophy options.