Sadly, a Gore Verbinski-directed version of BioShock is no longer in the cards, but when speaking with ComingSoon.net, he did provide some more information on why the video game adaptation never moved forward:

" 'I couldn't really get past anybody that would spend the money that it would take to do it and keep an R rating,' he explained, 'Alternately, I wasn't really interested in pursuing a PG-13 version. Because the R rating is inherent. Little Sisters and injections and the whole thing. I just wanted to really, really make it a movie where, four days later, you're still shivering and going, "Jesus Christ!"... It's a movie that has to be really, really scary, but you also have to create a whole underwater world, so the pricetag is high. We just didn't have any takers on an R-rated movie with that pricetag.' "

While most movie adaptations of video games don't work, BioShock could be a really interesting film, given the right director. The game has such a unique visual style and so much detail, that I don't think it would be that difficult to recreate it for the big screen. Hopefully, we'll see a string of successful R-rated horror films over the next few years and a BioShock film will be given more consideration. Thanks, /film.