Just released yesterday. Whereas Clear Sky was a prequel to the original, CoP is a true sequel.
Notable awesomeness just in the first four hours of play:
-greatly improved optimization over Clear Sky. Runs MUCH smoother and thus far no crashes.
-UI is much more useful/helpful
-enemy AI is bonkers, i haven't really faced many humans yet but the snorks, bloodsuckers, and the other things are all VERY nasty
i read that the devs hunkered down and spent most of their energy retooling the enemy AI, so i'm really looking forward to that. plus their reproduction of the city of pripyat itself is supposed to be extremely faithful and authentic.
gonna play the fuck out of this game ya'll