See the idea i have for this is simple: 1 Azeroth (Ours) 1 Draenor (Ours know known as Outland). WOD the way i understood it was always there, and running its own natural course which would make it exactly the same as our timeline minus our own intrusion into it. IE: Garrosh, Kairoz ect.. This created a break off point from our series of events and WODs. We dont know if there is a AU Azeroth as most assuradly there is becuase Draenor would have to link to something when the time was right unfortunatly the fact that our 'intervention' might have actually stopped Guldan from finding AU Azeroth.
People seem to confusing Alternate Dimensions and Alternate Timelines....they are not one and the same.