With a gtx, probably close to 17-18fps.
At high you can play it with no problem. These are the max settings (very high) that people are drooling over and essentially what we want to get over 30fps. Add in a new penryn cpu, fast 1600+mhz ddr3 and maybe closer to 19-20fps.
It will take sli, driver tweaking, and a gpu doubling the performance of a gt, gtx to go passed 30fps, i think.
But in the meantime I would like to see what others are able to achieve so we can play with this