Credit goes to fellow fan Tabby for bringing this news in!
Our charmingly evil sorcerer Valtor will be voiced by Josh Keaton. Confirmation comes to us via Twitter (screen capped by Tabby):
Some of Josh Keaton’s previous voice roles were Peter Parker/Spider-Man in The Spectacular Spider-Man and Young Hercules in the video game Kingdom Hearts: Birth by Sleep. I’ve never heard of this actor, so I don’t know how popular he is. Maybe some of you will know.