Bioshock will have it's 10 year anniversary in 2017, which really isn't all that far away. It strikes me as a perfect time to release a "Bioshock Anniversary Collection" - or at the very least a remaster of the first game. By that point I'd like to think that 2K would have also announced a new entry in the franchise, so it would be a good way to get some hype going.
Also, would people really be shocked if this happened? They're three of the most critically-acclaimed games of the previous generation (not to mention they sold really well), if anything that makes them the most prime candidates for remasters.