I'm waiting for it to pop up on steam first. Then i will

Also, with regards to performance, some gameplay videos have been smooth on medium playing with a measly 8600GT, so it seems pretty well optimised (although performance could be lower/higher on release due to optimizations/more textures).
I would think performance is going to go up relative to visual quality which will go up by even more resulting in slightly reduced performance but much better visuals for these settings. Hence why the minimum is an 8800 and not an 8600.