I doubt he's Ganon, in truth he's probably a warlord of some random group of Moblin-scum with no connections to Piggy. Ganon is more likely the fire-demon-balrog-thing shown earlier in one of the early trailers. But, most likely Ganon is neither, and just some new version of the Pig...or a shadow that you'll have to fight. Not the Moblin guy, I wouldn't believe it was him except, maybe, if Ninendo says so...