I know i will be able to run it on this PC, it's a mid range computer i got it for around 800 bucks, could've been cheaper if i built it myself but oh well.
OS: Win7 64bit
CPU: i5-2320 @ 3.00GHz quad
RAM: 6GB
GPU: GTX 550ti
Screen res: 1680x1050
was running everything on max setting in the betas (except for shadow on low and AA off) was getting a solid 60 frames while exploring around, dipped to around 35-40 in action and only problem i found was dips to sub 35 while looking at large bodies of water, turning off reflections would have probably fixed that, i hope? I am happy with how it runs on this PC, a gpu upgrade would probably run it on max setting at 60 all the time. Hope this helps someone with a similar setup, it runs really good.