Some new BioShock 2 PS3 trophies have surfaced indicating that there's yet more DLC on the way for 2K's return to Rapture.
Going purely on the names of the trophies, it appears that we're looking at a Modern Warfare 2-style spec ops add-on called 'Protector Trials' in which you have to earn stars by completing a variety of tests that also involve gathering ADAM supplies.
That's all we know for now though. There's no official name for the upcoming DLC as yet, no pricing and no date. For now, this is pure speculation then, but keep your eyes peeled anyway.
