Also, they stated that when killing a boss while in a party whatever is dropped by the boss while drop multiple times for each character in the party. Not sure if this is JUST for bosses since that is all that was discussed.
I think he meant quest items dropping for everyone off bosses. My understanding that is, the boss will drop an item for everyone, rather than the zerg fest / bot pickup that baal runs were. This way even if your a slow clicker or not botting you are still rewarded.