Well... didn't expect the typing for Decidueye, which also the localized name honestly meh. All the Tapus got revealed with two of them (Koko, Lele) having new terrain effects while the others (Bulu, Fini) have old ones. Fighting old relevant Champions and other characters at the Battle Tree is a nice touch, though I hope the new facility isn't just a rip from the Battle Maison or Tower. Not much else to say, except looking forward in using these Pokemon come late November.
So basically this trailer confirms one of the leaks that the Pokemon League is in construction and that the E4 + Champion will appear late in the game as usual. The Datamine leaks holds true with Cosmog's reveal, though I wonder if it "evolves" into Lunala given how close they are.
I liked the typing. I fear that Litten final evo was going to be ANOTHER Fire/Fighting. I can't wait to test them and see what they are capable of.
At the end of the trailer my head exploded! So awesome!