Correct me if I'm wrong, but this seems to be the first time we have three expansion "leaks floating around"
Last time we had The Dark Below VS Warlords of Draenor, and the less interesting sounding won.
Now the mexican (Gurubashi I guess) standoff is between Council of Glades AKA Guardian of Tirisfal expansion, Army of Light and Ther Dark Prophet
http://www.mmo-champion.com/threads/...an+of+tirisfal
http://www.mmo-champion.com/threads/...ce-I-THINK-NOT
http://www.mmo-champion.com/threads/...han-and-reddit
Now we will learn the truth on the 6th but before that, let's speculate.
Of all these three the Dark Prophet sounds like the most possible to me. The GoT expansion sounds like complete hogwash:
south seas, emerald dream AND several revamped cities, the only competent dwarf leader executed, Med'an having a role, Illidan appearing out of the blue, new Nelf starting zone, no thanks.
AoL has the benefit of being a more or less organic followup of WoD, but it has a few issues. For instance why would we care about alternate Azeroth? We stopped Garrosh cause he had a portal to actual azeroth. Draenei rogue? Tauren Mage? Undead Paladin? Come on, even Blizz isn't that stupid.
Plus, we go farther and farther away from Vol'jin, Sylvanas, and all the mess left on Azeroth after the end of MoP.
TDP reads like wishful thinking, but nothing in it suggests that it would be a bad idea.
Anyway it is safe to say that the villain is Gul'dan and/or Azshara, as the listed villains are Gul'dan, Azshara/ Gul'dan, Medivh/and Zul, Azshara respectively.
So, which one is it?
EDIT: Apparently there are 5 leaks. Can someone link the other two?