Heres a screen shot of it running at 1680x1050 on my system.
http://img1.yoxio.com/img/231065.jpg
Its actually at ultra high detected settings, but I had to enable tree shadows manualy. Unfortunatly they do tax my system, especialy fighting out doors. I get about 15fps in the wild, but fair 25-30fps in cities and 30+ indoors. This is running on a 7800gs with an XP2800 cpu. IMO thats awsome for this resolution.
One thing I have found though is turning grass off can yield just as nice eye candy and a noticable boost in fps. For instance..
http://img1.yoxio.com/img/231066.jpg
I think because I am so used to seeing just flat textures for ground, that my eye instead shoots for the swaying bushes and plentifull moving trees (with moving shadows) and goes "wow" because even that is still sweet to look at and not something you see today.
BTW yea this is HDR with no AA. Being on LCD I don't mind not having aa.. this resolution alone blows me away with crisp looking detailed images that I could care less if there is AA or not.