So i somehow avoided almost all of the info about sun and moon until the day when they revealed grown up Red

i have played every game up to pokemon X, and i skipped the hoenn remakes

i just have 2 questions

>how many new pokemons can i expect in this game?
Kalos had a very small pokedex so i want to know if all the new pokemons have already been revealed or if there are still new pokemon to disocver in the game

>i fucking love johto, is there any news on megas, alola forms or anything cool related to to gen 2 in sun and moon