I won't be buying this expansion because D3 was such a huge disappointment, I don't see any expansion ever making it fun. I think my highest level character was 37 -- I stopped when I got to Hell difficulty, because there seemed no point in playing the exact same content over a third time. Meanwhile it didn't seem possible to progress without spending real-world money. Blizzard lost me with this game.
But on a related note, I have a question. Sony Online Entertainment (SOE) is bringing out the new Everquest Next which looks amazing. But I swore off of Sony in 2000 after being a guide in the original Everquest. The guide program was so corrupt, and the John Smedley administration was so disrespectful of the players, that I swore never to buy another Sony game. Has Sony improved? After more than ten years I'd be willing to give them another chance if I hear that they're not the pure evil they used to be. (I know EA is still pure evil, but I haven't heard anything lately about SOE.)
Blizzard has probably lost me for ten years. We'll see if they still try to trick players into spending money, and whether they re-discover what makes game fun.