Z-Abilities, maybe? I still don't know what to make of Ash-Greninja, even moreso now that Ash-Greninja is actually in the game. Coincidence on Ash's part? Some kind of Chosen One antics? Shameless "fan service"? "Here's who Ash would be as a Pokémon, kids! Have you're very own Ash today!" Whatever it is, Battle Bond doesn't seem like a fill-in second ability for Greninja as a pokémon, but rather like a special fourth ability, hence a z-ability. If it is, then it is very possible that other pokémon will have it, or something like it.
On the other hand, I love the concept of Poké Pelago, and the sheer utility that comes with actually filling our boxes now, beyond simply going through the game without a care, or only doing it to have a start on breeding later.
The first part of the Mega debate has finally been put to bed, now only the second part remains: Will there be new ones? If there were to be, it seems like this would have been the time to reveal one, but on the other hand, between Alola Forms, Z-Moves, Ultra Beasts, and Ash-Greninja, why not add any more? The landscape is so radical at this step that there's really no point in stopping now.
I don't know what to make of Festival Plaza, other than we need it if we want clothes. I wonder how FC fit with BP.
Finally, the mid-stage starter designs seems to fit with the leak final forms. Dartrix gives me the same snooty disposition that put me off from Prinplup and therefore Piplup for years. I really like Torracat, and it reinforces my first impression of Litten. It's really going to be a shame if they turn this good line into that...wrestler, but the bell reinforces the belt. Brionne is cute enough that she probably would have put me in Team Popplio by herself, even without the leaked Litten final.
They really need to make Brionne female dominant, it's about time that we've had a starter that isn't male dominant. I know they do it for breeding reasons, but that was always a weak argument. I mean, Ditto were literally found in the grass outside of the Day Care in Gen II, and the only times where the starters were ultimately unobtainable after evolution were the Gen I games, which was moot for genders anyway, and pre-FRLG Ruby and Sapphire, if your Treecko, Torchic, or Mudkip were male. Otherwise, it was always easy to breed them out eventually, or even just soft reset for your prefered gender. Other than that, starters have a history of being fairly poor, competitively speaking. Some have their places in the limelight, but they never get far on their own. They always need some kind of upgrade, be it their hidden ability which is, more often than not, event locked, or they need a Mega to really get anywhere. Infernape's the only one that I can think of that really got anywhere on it's own.
On that note, I wonder if they'll opt to lock Ditto out until the Bank update. A part of me kind of hopes they do.