I'm running with the following system, and am getting very poor framerates (5-25fps) at even the lowest settings:
Windows 7 64
E6750 @ 3.2GhZ
4gb ram
Nvidia 8800GTS 320mb
So I'd say it doesn't look too good for your system at the moment. However, this is a very early and unoptimized beta build, so nothing can be said with certainty.