More then that Piggus
physically simulated particles, SPH based smoke and fog simulation, interactive cloth objects, dynamic forcefields
when I ran the benchmark on my 770 alone at max detail I had 44fps avg, and with the 460 as dedicated physX it jumped to 55fps avg.
As far as gameplay I agree its definately way better then the first one, especially the stealth, I managed to get one of the hardest steam achievements on that game which is shadow warrior, and thats to get though the game withiout killing a single human accept on the final battle. (Knockouts Don't Count as Kills btw) you just can't use a gun at all on them.