I tried the demo. The demo level looks very good and shows off the UT engine well. Combat seems overly simplistic (one generic attack, a generic defend, and a rune power attack). The rune power ups don't last long enough, either. Combat is rather boring with circle strafing defeating everything easily. Text is very small at 1280x1024 and disappears quickly, not that it really mattered because the "puzzles" were easy. EAX sound was rather messed up (probably fixed in the real game).
One kewl thing I experienced was attacking simultaneously with the enemy -- our weapons banged together with a metallic sound and we "washed" on that round! Hehe. I also love the game speed feature (90% works great for me).