2K Games has officially announced Rapture Metro Map Pack, which is the second content   Bioshock 2, which was revealed days ago in Major Nelson's blog by publishing a weekly list of new content expected shortly on the Marketplace.   The expansion will include six new maps, two masks and three new multiplayer objectives to unlock. The pack has been confirmed for 29 of the current month and will cost 800 Microsoft Points. Appointment in two days to download.