Twitter account posts image from original BioShock, asks fans what it could mean.
Has been profitable for the publisher thus far.
Free copy of original BioShock is a US-only promotion, 2K confirms.
Mass Effect 3 isn't the only game to have a cack ending. Here are four more - and we know just how to fix them!
BioShock Ultimate Rapture Edition, a bundle featuring the first two BioShock games and all DLC, has been listed by the BBFC.
"It's always about the stars aligning. We're still focussing on it, but it hasn't consumed us so much," says the Irrational boss.
Ken Levine has cast doubt over plans to turn BioShock into a film, stating that Irrational has "no need" to see the project come to fruition.
The first BioShock novel, which follows the rise of Rapture to a point just before the first game, is due for release July 19.
Money men not interested in backing his R-rated vision.