Great Observation and all the points are correct as based on the previewOK, my comments about this preview:
+ I hope once this arc is over, the next arc will involve what we saw in the opening: Ash, Goh and Koharu traveling with Leon in his "Charicar".
+ The Frozen PokeBall seems to indicate someone will capture Regice, but who? All things considered, Ash and Goh may enter an arc where they fight and capture ALL the Regis? Including the new ones: Regidraco and Regieleki.
+ Well, it was about time they bring back Ash's old Pokemon from Oak's Lab. I don't know why Infernape joins Ash's team, but I hope he won't be the only one to return. After all, once in the Ultra Class, Ash could really use the power of his most veteran Pokemon. And I would like to see some of them returning to evolve, like Gible or Totodile. The Preview showed us Charizard and Snorlax, so I would like to see them back in action.
**I wonder if Goh will like to count Ash's Pokemon and compare them with his own. By my count, Goh already has more Pokemon than Ash between his current team, Oak's Lab and his Alola's team; but Goh still hasn't capture as many Pokemon as Ash has own.
+ I supposed Iris would wear her clothes as "Champion", but don't get wrong. The most logical thing is that Iris is just the new Gym Leader of Opelucid City, nothing more. I wonder where is drayden now. And by the look of it, even if it caught her by surprise, something tells me Iris will enjoy the hug from Ash's Dragonite.
+ It's quite interesting to see Ash's Infernape vs Moltres, but considering Fighting Types are weak against Flying Types, I don't think Infernape will win. It COULD won, however, if it was Charizard who faces Moltres.
+ I'm not sure, but it would appear that Ash's Dracovish will have an Ice Move against Iris' Dracovish. I wonder which one.
+ It calls my attention a lot that Ash is wearing a police's uniform in one of those scenes.
+ Finally, if this arc is about finding Mew, something tells me Ash and Goh will meet Mewtwo once more.
I absolutely Agree with all the points