As reported yesterday, Luther Reigns was released from WWE and it now seems that it happend at Reigns' request. It was his opinion that WWE were not utilizing him to his full potential and with him getting older, he felt it was time to go. Concerns on the issue had been voiced before WrestleMania apparently.
The word is that Reigns wants more time to concentrate on real estate investments he has back in Arizona. In terms of his decision to leave, there is no heat on him from WWE management as he was up front with them about his concerns as opposed to complaining behind their backs.
There is a chance that Reigns may return in the future as he left on good terms with the company.