Siege of Orgrimmar
A coming War between the Horde and The Alliance? Does Mist of Pandaria spell out a departure from cooperation between the Horde and the Alliance against unifying threats such as Deathwing and the Lich King? Maybe not, apparently Garrosh has angered The Horde and a joint raid against Garrosh will act as the endgame for Mists of Panderia.
Foreshadowing of things to come in Mists of Pandaria:
Hopefully Blizzard will move to add more open world pvp events and dynamic content to counter the popularity of Guild Wars 2, Rift and Star Wars: The Old Republic which have focused more on “public questing” and large scale world pvp than has been present in World of Warcraft.