how are you doing the rock textures? I noticed there's a sort of highlight or light patch on each sharp corner. Is this done procedural or painted by hand? thanks.
Those hard edges you're making need to be beveled. They are way too sharp, it's going to look bad in the normal map and especially when the model is at a distance.
Trailer looks amazing, really sharp and stylish. Has absolutely nothing to do with the game, though - let's hope the game itself lives up to the trailer!