Since you vp people enjoy your leak time, here you go:
1) It is true that Rockruff will have multiple evolutions, but don't expect any major design change between the four of them. What makes you get the one or the other is the phase of the moon, which you can see from any promontory at night. Also it has a strong connection with the Z Stones (see Rockruff collar) and Synchro Evo (as the starters do).
2) There's also sort of a loose parallel line to Rockruff and his evo method, with a Pokémon that gets multiple evolutions based on the height of the Sun/moment of the day (read: Dawn, Noon, Sunset, it does not evolve during the night). It looks like a succulent plant with a "staff" with a flower on top, whose direction varies according to the evolution. Towards you – up in the sky – away from you. I think the type varies as well.
3) Talking about the Sun, some areas in Alola will have Sunny Day on by default. See the big rocky thing on the Island with the big ass tree. Also that's a very strange island, since time never passes and always stays day. And speaking about weather, Fog (from gen IV) is back!
4) Pokémon that I know will get an Alola form: Paras/Parasect (infected by Morelull) are Bug/Fairy, Golem is Rock/Fire (becomes sort of a lapillus, will talk about it later), Koffing/Weezing are pure Fire (like a "uncontaminated" version), Grimer and Muk are pure Ground (same reason). The only exception of non-gen I pokemon are Lunatone and Solrock, which look very much like Minior and have the same ability.
5) You've not heard everything about Poké Ride. In fact there will be quite a few minigames involving various Pokémon, such as: you can ride Alola Arcanine on extremely hot waters which you can't surf on (it can literally run on water, like Suicune), climb mountains with a new rock/bug spider monkey thing (you'll have to do a minigame where you have to avoid certain falling boulders, but then again that's the only way to catch an Alola Golem without trading a Graveler. Tortunators are also involved), ride Hippowdon in a desert dungeon, and you'll have to watch out for Sandygasts and Palossands that will pop up from nowhere.
6) You'll get 4 Totem battles in total: Gumshoos, Lurantis, Wishiwashi and a pure Fire feminine-looking pig with lava flowing all over.
7) About the Pokémon we've already seen: Komala will evolve once in a more bear-ish looking Pokémon, and it will be able to throw around the log when it doesn't sleep on it. Name is Ibearnate. Kind of a Snorlax guy.
Pikipek will evolve twice, getting more streamlined and the Steel Type in his final stage. There will be a subquest where you'll have to search for different tree markings across the region made by this Pokémon. Middle one is named Perfowl, last one Fowldrill.
Bounsweet will inherit the Fire type when it evolves (its line is based on the "flavor" concept, from sweet to spicy). Name is Pepperot.
Tortunator's pre evo is like an upside down turtle with a big weak spot/button on the belly. Name is Krakatuga.
If you're interested in one point or the other I can kind of draw, so I'll be glad to give you a visual representation (from what I remember anyways).