Uses DX11? There is no tessellation, no compute shaders. I bet they just used the DX11 compression features and then use that as a basis to advertise "this is a DX11 enabled game" when in fact it's still running off DX9. What was said is correct. They use the same engine with very very minor tweaks that do nothing visually. Of course it looks a little better...we have cards that can do better filtering and AA.