WWE has quietly moved the official profile of Rey Mysterio to the Alumni section of their official website. It would appear he is officially finished with the company, even though they have not issued a statement about his departure at press time.
We reported here on WrestlingNewsWorld.com Premium on December 26, 2014 that WWE had dropped all plans for his return to the company. We were told at the time they were close to granting him his release from his Performer's Contract and he was expected to be let go before Wrestlemania 31.
We've contacted WWE's Public Relations department and are currently awaiting official confirmation.