Okay, so to clarify that I am not leaking this information, I'm just going to post the link right here and you can decide for yourself. But did come from the Riddler's channel--I am not a leaker. Here's the link:

http://tieba.baidu.com/p/4780646955

And here's what was translated:

UB's are not catchable. They are the true enemies of the story.

Lillie's mother (Lusamine) studies hyperspace Pokémon (UB's).

Lillie it's involved in the plot. She and UB merge in the climax.

Alola has 3 Professors, Lusamine studies hyperspace Pokémon, Oak studies Alolan forms, and Kukui studies Z power (Z moves and Z forms, which are induced by Z moves).

Chinese starters are real. Grass/Flying, Fire/Dark, and Water/Fairy. No split evos.

Chespin, Fennekin, Froakie, Rockruff, Rowlet, Litten, and Popplio have Z forms in their final evos.

Jangmo-o is the pseudo.

Alolan Fearow, Nidos, Golduck, Golem, Rapidash, Muk, Weesing.

A new Pokémon can evolve into Solgaleo or Lunala by a special method.

Marshadow is Ghost/Fighting.

Aether=bad guys.

No new Megas.

No PWT in Alola.

Battle Frontier comes back.

New dolphin Pokémon. Pure Water. Evolves into Water/Dragon.

Rugby Gorilla is Ground/Fighting.

Confey evo is humanoid. Their loop is in their waist now.

Bounsweet is Paprika-like. Grass/Fire.

Morelull evo is a larger Morelulll. Type and ability are the same.

Salandit evo. Type and ability same.

Wimpod is the new Magikarp. Same type, change ability to Unnerve or Pressure.

Now again, I am not the leaker. I found this on the Riddler's channel, and it sounds familiar. So somewhere in there is something credible to examine. But do take this information with a grain of salt.