I think it's been stated a few times that even though the title is developed with current hardware to save time compiling, it is heavily tested on older hardware to make sure it will be able to run on a wide range of PCs.
That's part of the reason the screenshots in the updates are mostly captures from lower detail settings (eg, DX9, no anti-aliasing etc).
I think SoW will scale pretty well thanks to the multi core optimization. I'm guessing that everyone with 1-2 year old hardware will be able to run it on lower detail settings, medium for current mid-range PCs and for full detail we might have to wait a couple of years for more powerful PCs.
In summary, it will run on a lot of different PC specs, just not at full detail.
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