Stupid tech crap:
A friend and I picked our copies up today...
Playing this on a friend's stock Core2Duo 6400, 2GB DDR800 RAM, stock 8800GTS 320 MB with 'dynamic lighting on objects' and everything (AA, AF, draw dist., lighting dist., veg. distance, etc.) except for texture quality maxed (it's a notch below max) at 1600x1200 (60Hz, V-Synch), the game looks pretty awesome and holds a pretty decent 30+ FPS with few hitches or hiccups except for when things get dark and dynamic lights from flash lights and such on the overland. With everything maxed completely in 'static lighting', it's 60+ FPS all the time, though it does look quite a bit flatter by comparison but still pretty ****ing nice. Hopefully, some optimization will come in the form of a patch or two soon enough.
Playing this on my mildly updated computer at home (stock P4 2.6 HT, 2GB DDR400 RAM, stock X800 Pro 256MB), I can play at default medium settings at 1280x1024 (with static lighting, of course) at better than 30 FPS on average. Looks pretty damned nice, too.
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Only been playing for a few hours, but already I love this game. It's like a Russian Fallout meets a mix of Deus Ex, Op. Flashpoint, and Far Cry. Love it, love it. Very atmospheric and very fresh-feeling. Please, please...don't let it be too long before someone mods this bitch with (at least) 2 player co-op.