One small observation: this trailer/teaser focused only on things that are at the very end of alola journey (not including post game)

That would mean they're almost done with advertising the main parts of the game. So for the remaining month they'll still reveal:

Light form (Necrozma i'd imagine) from the artboxes
More on these new people (art, basic info)
Ultra Space "soaring" that they teased today (probably just us visiting the small Ultra Spaces)

And then all thats left are z-moves and eventual post game content (if there is one)