Bioshock: The Collection is a remastered collection of the three BioShock games from the previous console generations, these being BioShock, BioShock 2 & BioShock Infinite.
2K Games officially announced on June 30, 2016 that the collection would be coming to Xbox One & PlayStation 4 on September 13, 2016, then to PC on September 15, 2016.
If players had previously bought the PC versions of BioShock & BioShock 2 they were able to download a patch so it matches the new release for no extra cost. BioShock Infinite, however, was not released as part of the collection for the PC.
There is new content exclusive to the collection. In the original game players are able to walk around a virtual museum of concept works that never made it into the game. The downloadable challenge rooms are included also. In BioShock 2, the Minerva's Den DLC is included but the multiplayer portion of the game is not. Bioshock Infinite contains all previously released DLC.