The official WWE website has moved Christian’s superstar profile to the Alumni Section of the website which pretty much confirms he is done as an active in-ring competitor. 

His last match was back in March of 2014, and he has been out of action following several injuries, including suffering a concussion. They have updated his bio with the following…

“…Christian was out of action for nearly a year with a shoulder injury. He returned in June 2013, once again poised to win the World Heavyweight Championship. Although he never regain the title, he solidified his legacy and left active competition still at the top of his game.”