I doubt there are any real differences between the two other than the type of AA used. I just noticed your post on B3D, and it confirms my speculation that they're using QAA on the PS3 so the texture details are going to pop up more on the 360.
If the tearing and frame rate hitches aren't fixed up in the final versions, I'd say that both versions are essentially the same much like DMC4.
Seems that Kobayashi's team got a better grip on the PS3 hardware or made better design decisions than Takeuchi's team. The base platforms for their games is still the PC after all.