So I jumped in a public game last night and to my great surprise I wasnt transported to a dungeon but instead to the Whimyshire, a land of murderous unicorns and care bears. The entire level is decorated like a childrens cartoon with happy face clouds, rainbows and flowers, until of course you meet its residents. I was playing Hell level so we were only able to kill a few before people started dropping from the game due to the difficulty but I did manage to snag a lvl 55 fist weapon for my Monk before I too quit the level. Im not sure how people enter that level but Tigranes mentioned a staff that you have to assemble.