2K Games seems to be gearing up for a BioShock-related announcement. The official Twitter account for the game has posted an image of the iconic Big Daddy and Little Sister characters from the first game, and the 2K Games Twitter account has retweeted it.
https://twitter.com/bioshock/status/748194389076258816
Although no further details were provided, it has been speculated that the announcement will finally confirm the long rumoured BioShock Collection. Although this hasn't officially been announced, it has been leaked through multiple retailers and ratings boards.
This would literally be the best thing ever.