Well did you look at any of the videos? Because the videos, especially the boulder one, really show what this chip can do. The effects the boulders had, as well as the particles flying off of them, were amazing. No video card on it's own can process those physics the way that did.
Once this PPU chip becomes available, I think I would liek to see someone get one and pair it off with dual 7800GTXs or an ATi X800XT. That would possibly be the most realistic image ever seen.