According to the latest edition of GameInformer, BioShock 2: Sea of Dreams - the follow-up to last year's incredibly wonderful... BioShock from 2K, is to get co-op play as well as a Big Sister but no Big Daddies (or Giant Haystacks).
Apparently the game will also be launching on PS3 - rather than hanging around exclusively on Xbox 360 looking aloof.
Other details include the fact that due to Rapture being flooded, the game features underwater levels; what with the water - the addition of hackable spliced animals, Soviet invasions, new telepathy plasmids, new health system and a giant squid boss - it's all shaping up to be lots of super fun. We can't wait.