GTA V looks absolutely stunning! I also have high hopes for the physics in the new Carmageddon coming out next year.
Does it? I don't believe in multiplatform
It won't look as good as it could anyways, the PS3 and Xbox360 are old now. Even if you optimize the code, they just can't handle high res textures. If you look at what IChancer does to GTA IV on PC, or if you look at Skyrim with mods on PC, thats just miles away from the console versions.
And as the big publishers don't believe in de PC anymore, they will just convert the console version. Do I remember right, GTA IV did not even have AA, right?
I guess the next big step for PC gaming will come with the next gen consoles. Maybe except some PC only games, like the ridiculous sexy star citizen!
EDIT:
Ok, i have to admit, I love the look of it, the setting, but I doubt it will look that much better than GTA IV