I could see them adding a delay to his hook where he swings it over his head a couple of times before throwing it, in exchange for a shorter cooldown. He gets more opportunities to hook enemies in and control space, but enemies get a longer window to react. It would nerf Flank Hog, but improve his teamfighting power.
They could be doing something with his hook again, though I’m not really in a position to suggest what it could be. Perhaps they chose to mess with the way he tosses his hook/reels it back in, or something new with the scrapgun for whole hog?
I believe the most problematic areas for Hog currently are Take a Breather and Whole Hog. Both are beyond easily counterable by about half of the roster, and with Ana being the meta support, you’re guaranteed sleep darts and anti-heals, which both mostly affect Hog’s breather and ult. If they’re not adding something to his kit, I would assume one of both of those will need to be looked at. Whole Hog is especially a joke with the endless amount of CC in the game.
I’d have accepted the ugly prototype in PTR if they couldn’t finish it in time. They weren’t afraid to remove Reinhardt because he apparently broke the game so severely, so they might as well have given us a barely-worked-on ability to theorize with.