A new trailer has been released!The first evolution stages of the starters were revealed: Rowlett evolves in Dartrix, Litten evolves into Torracat, and Popplio evolves into Brionne. These Pokémon bear striking resemblances to the final evolution leaks that were being passed around awhile back.
Join Avenue from B2W2 will be making a reappearance in the form of a place called Festival Plaza, where you can complete missions and tasks with other players to earn Friend Coins that can be used to purchase various valuable goods and services.
A place called Poké Pelago is a resort for the Pokémon in your PC, and can attract wild Pokémon as well as train your own and find items like evolution stones.
The Z-Ring allows for Mega Evolution as well, but no new Mega Evolutions have been shown. Additionally, the VGC '17 rules do not allow Mega Evolution, so it's possible there won't be any new ones at all.
A special demo for Sun & Moon will be available on October 18th, much like the one for Omega Ruby and Alpha Sapphire. This demo will feature a Greninja with the special ability Battle Bond, which transforms it into Ash-Greninja, a "synchronized" form from the anime, whenever it defeats an opponent. You will be able to transfer this Greninja to the full game after completing the demo.