Sam Raimi decided to work on Oz: The Great and Powerful instead of a World of Warcraft movie, his role in the production was put in question. Sure enough, he confirmed after his Oz: The Great and Powerful panel at Comic-Con that he was no longer involved with the Warcraft film at all.

“Actually, they don’t have me directing World of Warcraft anymore because when I took the Oz job, they had to move on to another director,” Raimi said. “They had to start making it.”

Source: Crave Online