Well, we know John Cena won't "compete" at WrestleMania 32 on April 3, 2016, at AT&T Stadium in Arlington, Texas, because the man himself confirmed as much. Reports suggest he could be out of action until sometime in July.
But that doesn't mean he can't make an appearance, something he's teasing:
It's the biggest event in WWE history. It would be a surprise if he didn't show up.