Have you ever seen in China forum leaked, but it is all in riddles with no answer? I have the same sources for leaks, and I do not want to play around.
I do not speak English, and the use of Google Translation Sorry!
Warcraft expansion leak title 军团之怒 of 'wrath of legion', what follows is what it means and the story:
Gul'dan will take us through the Twisting Nether, to the tomb of Sargeras on Azeroth, in order to call the Legion to Azeroth.
New heavy influence of demonic legion invasion. Azshara and the Naga plan to help summon Sargeras.
The remaining Zandalari trolls are introduced, along with Zandalar.
The Horde gets a new Warchief, and Sylvanas is not satisfied with the choice.
One theme is Sylvanas' activities in the north and Tirion's intervention.
Features:
Demon Hunter class, because they are effective against the Burning Legion.
Three specs include tanks, melee DPS and ranged DPS using the same weapons as hunters.
No new race, but new customization options like tattoos and brown orcs.
Garrison-like system, where you become a hero and send troops to combat Azshara's forces and commanders.
It is more expanded and has similarities to an RTS, bases and ships to explore the island.
It has five new zones?
On release: 6 dungeons, one of which is the Tomb of Sargeras, where Gul'dan would (will?) die.
There are three raids at launch, but one is small, few bosses.
There are World bosses, and there are sea monsters like squid.
All classes have new skills and talents.
Some classes are being revamped, like Warlock (demonology?) moved to a more tank-like role.
For PVP, there is a sea battle with ships and cannons to control islands.
A new arena, and some of the old ones are being deleted.
(?)There is no new area like Ashran or Wintergrasp. OR
There is a new PvP area unlike Ashran or Wintergrasp.
Each faction has a new capital on islands near the maelstorm.
(Really not sure about this one, but if I had to give a guess)
A new system where you can finish a cast early, doing less damage based on how much of the cast you finished.