Just been playing it - was a good blast - much better than the mod. The MG is actually quite useful now as it does provide suppression - you screen blurs slightly when a bullet goes near. Tracers also bounce off hard surfaces too.
The Stalingrad airfield map is a work of art. The rag doll death stuff is pretty eerie too.
As for the tanks, they are much improved and long range fire fights are well modelled.
Overall, the immersion factor has been upped considerably.