tomorrow is when (i think) the public at quakecon gets to try it out, so expect lots more confirmed features. random confirmed crap:
you can kill bunnies
3d puzzles out of the main quest are more common than rare
character creator confirmed to actually work well
torches can be used as weapons
"hit detection, sound weight, all feel great compared to oblivion"
the caves sound 100x times more well designed. multi tiered floors with waterfalls flowing down them
you can request bards to play songs for you in taverns
you can store points when you level up instead of spending them