WWE has confirmed that Cesaro has a shoulder injury, a left shoulder rotator cuff, and has had it for a few months now. Cesaro had worked through the injury, knowing something was wrong, and had an MRI done. He was looking forward to getting to rehab the injury but received a call the next day saying he tore one tendon and partially tore another one. He's having surgery this afternoon and noted that the official timeframe for his return is 4-6 months, depending on how surgery and rehab goes.
Source: Wrestlinginc, WWE.com and so forth.
2015 is the year WWE wrestlers will look back on and get PTSD from.