First of all, congrats on maining Ganon in every single game he's in, I applaud you.
Second, from what I've seen and recorded in my own post on this discussion thread, he hasn't been buffed too much in frame data (the biggest change is Volcano Kick, but it's still unusable), but he's been HEAVILY buffed in damage. As in, most moves deal 2-10% more than before. Dash Attack deals 17.6%, Fair, Bair, and Dair deal over 20% sweetspotted, etc. Normal techchases and combos will end up dealing massive damage, trades will always be in Ganon's favor, and a single mistake could mean death.
He's also been buffed a little in speed, but not enough to make him 'fast.' Then again, I haven't played the demo, so I dunno. I've heard people say "He's got his Melee mobility back," but I can't really say yes or no on that for sure.
My best guess, however, is that he'll remain a bait and punish character. Especially with the return of dash dancing, he can force his opponent to approach (Up Smash will probably be replaced with Nair for that baiting tool, since Up Smash is now just as laggy as all his other smashes), let them make a laggy mistake, and break in with his own devastating attacks before returning back to neutral. I don't think he'll be high-tier, maybe high-mid at best, but he'll definitely be a beast in an advantage state. That being said, he's slow and doesn't have a very good recovery, still, so he'll be pretty screwed in disadvantage.