Tameem Antoniades, Co-Founder of Ninja Theory, has told CVG that 3D tech on the PlayStation 3 will be "limited" due to the restrictions of the current generation.
Antoniades had this to say about what 3D needs to function properly, "The problem is that to do 3D properly you need to render 60 frames per second, per eye. And at least a 720p resolution."
"So in essence that's 1080p rendering at 120 frames per second, and the current generation can only process very rudimentary graphics at that spec," Antoniades concluded on the current generation. This tech is beyond what most games can handle, which is around 60 frames per second maximum.
It's difficult to take this news too openly since it seems that there have already a few games that have managed to pull off 3D graphics, such as Avatar. Sure the 120 frames is ideal, but 3D is still probably pretty reasonable with current hardware specs.