I recently read a report that Shelton Benjamin had a successful shoulder injury. His doctor has suggested that he could be back by 4-6 months.
Last year, Cesaro also underwent surgery for the same injury and returned to action at Raw a night after Wrestlemania (to a huge pop, I guess).
They are saying that He might be back just in time for Wrestlemania 33. If not, then I guess that he'll return just like Cesaro did i.e after Wrestlemania weekend ends.