This is the first time we have seen the new dynamic camera and evade mechanics exclusive to the console versions in action. It has also been confirmed that there will be no real money auction house.
IGN posted a 10 minute video of them playing the game at PAX.
At around 7:14 in the above video a monster drops a globe on death. This globe when clicked gave an "Increases EXP gained greatly" for 10 seconds. There has been no official word from Blizzard on this feature yet.