Yeah did you see the part with the little black cubes? I doubt 7800 gtxs sli'd will run that over 30 fps. I thought the animation was stupid when the dude shot that thing with an arrow. It like flew backwards. It should have hit him and then he would collapse.
EDIT: Also, its so impressive, that, and this goes along with the thing I just said, i doubt current gen computers will be able to run it acceptably. All of that shit being rendered in real time? I wonder what kind of computer they're making that on? Whatever it is, I want one.
Finally, I think the most amazing thing is that its being made by 3 people.