so are they just gonna make raid bosses drop em or what?
BL1 handled it so that certain varieties of enemies (namely Badasses) dropped specific pearls, I suppose serving as a prelude to BL2's loot system.
You also had extremely small chances of finding them in new varieties of chests that the DLC added.
It also added Crawmerax, who had a chance to drop pearls. This chance was greater than anything else you'd ever find, but was still miniscule, at best.
I'd expect that the raid bosses will have pearls added to their drop lists. Certain Badasses might drop them. And maybe, just maybe- Gearbox will add them will respectable drop rates to chests. --- If you don't use proper grammar, you're a communist. -George Washington, First President of the USA