Just as growing segments of the population are expressing that they're sick of too many movies being offered in 3D for no good reason other than to get people to pay more for it, it appears that the "pirate" community is jumping on the 3D bandwagon as well.
They're getting better and better at offering unauthorized versions in 3D, either via applying a tool to make a 2D rip appear 3D, or through some new methods to fully rip a 3D Blu-ray.