No I don't mean the demo on the Novalogic website. I mean the version Novalogic sent to some of their fansites, such as
http://www.dfhq.net and
http://www.df-inside.com This test officially expires on Christmas day.
I've been playing it quite a bit on my LAN and am enjoying it quite a bit. At 1280x1024 resolution with everything maxed and 2xFSAA & 16x aniso I get about 15fps on my system, a huge drop over the official demo

They have improved the graphics a bit more as they always do. At 1024x768 I get about 25fps with the same settings, which is acceptable to me at this point as I expect they'll have more optimization done by February. The minefields are fun I didn't believe the signs at first until boom I was dead.
The only play mode in this is capture the flag and the progressive spawn points are in ctf games