Often, the most important things are lost in the crash of events. The tumultuous overthrow of the Warchief, Garrosh Hellscream, obscures events that occur elsewhere and the implications of those events. This is natural - Orgrimmar's siege was a pivotal moment in the history of Azeroth and its resolution changed the political landscape of the Horde and established the Alliance's willingness to come together. An untested Warchief now must contend with a Horde full of fractious leaders and the roar of the Lion is once again heard over Azeroth. These events, the culmination of a year spent exploring a new land, are not surprisingly dominant in our minds.
But in the end it is in Pandaria that the truth is revealed. The world has changed. A profound alteration to a land locked away for ten thousand years, imprisoned by pride. Events were set in motion by our discovery of the land behind the mists, but their final denouement was not on the floor of Garrosh Hellscream's bastion beneath the streets of Orgrimmar, but rather in the Vale he casually destroyed to fuel his ambitions.