WWE moved Rey Mysterio to the alumni section of their website today. That would indicate that he has been released but there is no confirmation from WWE yet.
Rey’s deal with the company expired last year but WWE exercised a clause in the deal that allowed them to keep him for “time owed” to them since he’s been out with injuries. He was expected back around Survivor Series and creative was told to come up with ideas for him but things seemed to fall apart. The last word as of a couple of weeks ago was that Rey was finally getting his release soon.
It’s no secret that Rey has been interested in doing business with Lucha Underground and he was backstage at one of their shows several weeks ago.