As the official said here:
http://us.battle.net/wow/en/blog/2658255#blog
"
Yet this auspicious event ended in tragedy. The details are still unclear, but word has spread that an incredibly powerful Twilight's Hammer agent, shrouded to hide his identity, interrupted the ceremony and struck down Thrall with dark magics..."
So that means we need to face the truth that our leader betrayed us? - The only orc that put his entire life to walk upright and save the Azeroth.( Dont tell me the Garrosh, he's stupid!)
Yeah. Maybe we can return his spirit by "overcome his doubts, his willfulness, his desires, and his rage", so what do you think this poor Shaman will do if he notice or remember what he have done to this world when he'd been changed?
Again and again, Blizzard drag our heroes into the dark side and ask us to fight against them. Why?
I dont like it! I'm so glad that I've already quit the game.Btw, my friend also said he's quiting WoW if they take the Thrall out of game.
At the end, My respect to you, Thrall!