I was looking around trying to find out when the UT2007 demo is comming out, and I found this demo that's based on the Unreal Engine 3. Apparently, nobody really knows when the ut2007 demo is comming, but, if anyone is curious to see how their rig copes with the new UE3, give it a try.
btw, it is also a multithreaded CPU demo. It was presented '05 intel developer forum to demonstrate the Pentium D. I haven't actually tried it yet 'cause i just found it.(and it'll be a pain to get it over dial-up)