Pre-ordered Moon today.
#TeamLunala
From what I have seen in all of those trailers is that GameFreak seems to have found a balance between catering for their usual younger playerbase and keeping the game relevant/interesting for the competitive/older playerbase, and a friend who's dropped the series right after the 3rd Gen has made a lot of good points I probably would not have thought of, since I've been following every main game from the start. I mean Pokémon SuMo, by the looks of it, is still the same colorful world we're all used to for generations, and so kids (and big kids - us, so to say) will most likely have no problem welcoming this new game. But I can't help but think that the content of the game is also aimed at an older audience.
First, Alolan Forms which are exclusively 1st gen critters only : at this point I am pretty sure that it's a good marketing move from GF's part to get returning players who dropped the series years ago. They'll basically rediscover some of their favorite mons - for some people they're the only ones they've ever known - under a new light.
Then, the introduction of a new, seemingly less ridiculous-looking bad guys who do not seem to have any "end-of-the-world"/apocalyptic motives (pure speculation, judging from their appearance only, who knows what they're really up to), similar to what we had with Team Rocket, the Pokémon counterpart of the mafia.
A more immersive game with lots of different camera angles and the loss of the grid-based movements and structure (well, it's still a grid, but it's pretty well camouflaged).
New abilities and mechanics which are all at least interesting, and a lot of seemingly competitively viable ones. More serious players may get a lot more toys to play with if that's the case, despite maybe not having as many new pokémon as with the previous gens. And let's not forget Z-moves.
Elements which I think are more mature and often found in supernatural or sci-fi works : sorcery and rituals and stuff actually being core to the world and not just a gimmick found in one particular location. Hopefully same thing with those chimera-things. They seem to be everything but Pokémon born from nature (are they even Pokémon??), and I can't help but think they're some sort of Pokémon experimentation that didn't go as expected (or they are actually the wanted result? I really can't wait to find out more about those.)
Anyhow those are my current thoughts and although I can make sense out of it, chances are what I've written might be a bit farfetch'd. I'm hyped as fuck right now.