Titled The Thunder King, the patch is live now.
According to Blizzard: “Lei Shen has consolidated his power on the Isle of Thunder, and if he’s not dislodged, his reborn army will threaten all of Pandaria.”
“It has been written that when the great Lei Shen first looked upon the lands of the mantid, he did not feel fear, but inspiration.
“As he began to unify his people under a single banner and subjugate the other races of Pandaria, he knew that the mantid would never succumb to his authority.
“They spoke his language, the language of strength. He commanded his slaves to construct the Serpent's Spine, a magnificent wall that spanned the length of the empire.
“It would take many generations to build. But Lei Shen knew how to motivate his subjects. Fear. Fear of the mantid moved mountains, raised armies, secured his empire, and built his wall.
The patch will bring server-wide events surrounding the siege on the Isle of Thunder, new factions, world bosses, and more, added Blizzard.