I entered the lowest level of the third dungeon in the act 1 battlefields and found it to be completely empty.So no boss fight and no loot. <img src="/ubbthreads/images/graemlins/sad.gif" alt="" /> This was with patch 1.42 installed,so i hope it gets fixed in the next one.
Mine was empty too. It's random, they can be empty sometimes. Pretty sure it's not a bug. In my case, the first 3 quests were at the bottom of dungeon 1, the last two quests were at the bottom of dungeon 2, and nothing at the bottom of dungeon 3.