I found this on a onion site. author claims to be working at western marketing department. I don't know how much reliable it is.

>112 new pokemons, including legendaries
>the 2 box legendaries are steel and grass/earth
>third legendary is psychic/fairy
>grass-rock ,fire-fairy , water-ghost 3 starters final evo
>3 new baby pokemon and 4 phase 2 evolutions from previous gens
>rival comes from Kalos
>Professor is called Benjamin
>New steel eevolution
>Gyms are both for battling and sporting purpose
>there is little exploration, but quite a bit of backtracking after you unlock zones previously unaccessible
>huge change in breeding that make having a perfect iv team much easier
>shiny -hunting item
> no kalos , but an huge island for part of the story and post game
>armored evolutions: 2 kind of armors per pokemon, items don't use the same slot of ordinary hold items