WoW Mists of Pandaria Beta: Meditation
The task everyone was waiting for in the last slide: meditating in front of this shrine. You have to use the left and right arrows, which act as a relaxation and focus action, to keep the blue bar as close to halfway as possible. I'm not sure whether the requirement was exactly 50% or for a certain amount of time, but it seemed to take forever. I guess that added to the extent of the waiting line.
Screenshot of World of Warcraft Beta game client by Wally Bahny for TechRepublic