A fourth ratings board has rated a BioShock: The Collection for PS4, Xbox and PC, this time being the ESRB. The game has previously been rated in South Africa, Taiwan and Brazil. The rating mentions, that this is a collection of all three titles in the series, Bioshock, Bioshock 2 and Bioshock Infinite.
2K has yet to comment on the situation, but it seems pretty certain that an announcement is imminent.