I don't know if the rumors are true, but the timing seems right. People like him tend to see through major milestones like launches before parting ways with a company. A lot of people like him, some people think he's a little fake, but I don't think anyone has said that he's a bad developer or businessman.

They just launched Kunark, which means he would have seen through his final expansion if he does leave, and someone else can take the helm from square one on the next expansion.

As for all of the recent interviews, I would have expected nothing less than seeing all of them appear with his name on them, because that's what good/smart devs do--their job.