that engine has "DX10 enabled" written all over it. seriously, the last time i saw a tank rendered with that much detail was a screenshot from "Crysis".
my one complaint is the textures on the windows in the third screenshot look a little grainy, and they're also conflicting a bit with the detail on the edges of the windows. otherwise, it looks pretty solid graphics-wise.
See the struggle of the faithless lot as they negate their time
How low to sink to the depths of their frame of mind