I've seen videos of the leaked full version where they tweaked settings using config files and the game looks amazing. I tried the multiplayer demo and I immediately noticed a difference in quality (read: worse), especially wrt the textures.
I think we have a lot more to look forward to once the full game is released. (However, I better be able to shoot down trees still!!)
Check out the Steam store page for more sweet shots. And search for videos on youtube (hint, include 4x580 in your search)
btw, I get 60fps (but I have vsync on, so I don't know how much higher atm) @ ~5240x1050 (bezel compensated) with AMD Phenom II X4 965BE and 6970 CFX, all at stock currently.