been playing it for a while tonight. what its not is the original with new graphics. they've updated a lot of the maps to give every location a different and more realistic look. not that it makes any major change to the gameplay, its just that the maps have a much more lived in look.
combat is about the same, but the weapons have a bit of a different feel to them. the pistol, for instance, has a much higher rate of fire (its still semi-auto), and the soundfx for the gun firing actually seems to have some kick to it. the SMG is now modeled to look like an MP5, and it fires in 3 round bursts. a couple other changes, too, but i don't want to spoil anything.
overall package so far: very impressive.
See the struggle of the faithless lot as they negate their time
How low to sink to the depths of their frame of mind