There's a plethora of vids out there (most in Russian, though).
CoP is looking amazing . . . from the expanse of the maps, to reworked visuals.
AFAIK, CoP will be using the X-Ray 1.6 engine . . . which is basically the same as the engine used for CS, with all the other patched in features (DX10.1, MSAA, Ambient Occlusion, etc.). Hopefully, this will mean there's been more optimization of the engine itself, as well as having some of the few rendering gripes fixed.
Either way, big fan of the series here - I'll defi be nabbing it. For those that aren't sure, wait a couple of months after release . . . I'm sure the price will fall like a boulder over a cliff.