I never liked primate pokémons, don't know why but I always found them ugly or uninspired. These boys though, they totally change my mind: Passimian is the first lemur (as everyone already said, it confirms the "rugby monkey" leak so... Dolphin and Snowman confirmed?), and I love it in its simplicity. Maybe I would've find it a bit uninspired if it was from an older gen, but I love its animation: I expected something terrible from "rugby monkey" considering how I didn't like much primate 'mons, sports and anthropomorphic 'mons: instead I got a new, simple and refreshing design with splendid animation. However, as much as I appreciate Passimian, Oranguru just hit the right spot: I love it, i find it a magnificent interpretation of an orangutan, and the esper/guru vibe is just perfect. Both lemurs and orangutans are island species, they fit really well the Alola's region.
Never been a fan of Pikachu either, but I do find CATASTROPIKA amusing... Can't really find it interesting though, as it has to be stupidly strong to be a better option over Light Ball (not that it would surprise me at all, as they finally got the chance to make their mascotte OP).
Extreme Evoboost has been largely discussed already: I love the mahō shōjo vibe, and it will be definitely instabanned in LC... It will indeed make Eevee much more viable in lower tiers, but with Baton Pass restrictions I doubt it will get a chance to shine in higher tiers.
Differently from usual, my opinion on Lycanroc didn't change much with the animated models: I like midday form, and it looks much more promising competitively wise (high speed, rock priority, sand rush), and I'm still not fond of the midnight form, I'm even a bit disappointed by its typing and abilities... Since these games have lots of original ones, I hoped this was the case... We'll see for the respective stats and movepools.
Trainer customization looks awesome this gen, hope it'll be much easier to get and affordable in-game... It does look really improved compared to XY. Female trainer is definitely going to be the superior choice for customization, males generally have to be a bit older for that... Beard will be obviously a straight-up Nope, sadly (I have my beard since middle school), I do hope there'll be the long hair option for male at least.
Pokemon refresh is mostly an updated amie, and I like that. Many times I spent too much money to cure my team with items out of batte, or I annoyingly had to go back to a pokémon center: now it'll be easier and funnier too.