There's been quite a bit of new Sun & Moon info today, which can be found in Pokemon's new YouTube video in the link below.
It seems that you will be brought to Alola (The new region) be your cousin, who's apparently named Kukui.
The region seems to be tropical, similar to Hawaii. (Which. in my opinion, is probably where the region is based off of, as Alola is spelled very similarly to Aloha.)
The starter Pokemon are an Owl, Cat, and Seal named Rowlet, Litten, and Popplio respectively.
Rowlet is typed with Grass and Flying, making it the second first form of a starter Pokemon to be dual typed.
Litten is Fire type, Popplio is Water.
The legendary Pokemon have been revealed, but nothing more than their design and which game they will appear in.
The set release date for Sun & Moon is November 18, 2016.
There is a little bit more info on the Pokemon on the Sun & Moon website. http://www.pokemon-sunmoon.com/en-us/
Species: Grass Quill Pokemon
Weight 3.3 lbs.
Possible PokeDex entry: Rowlet can attack without making a sound! It flies silently through the skies, drawing near to its opponent without being noticed, and then lashing out with powerful kicks. It can also attack from a distance using the razor-sharp leaves that form part of its feathers.
Species: Fire Cat Pokemon
Weight: 9.5 lbs.
Possible PokeDex entry: Logical but also passionate, Litten always remains coolheaded and doesn't show its emotions on the surface.
Species: Sea Lion Pokemon
Weight: 16.5 lbs.
Possible PokeDex entry: Popplio's swimming speed is known to exceed 25 mph. It's better at moving in the water than on land. Still, when it's on land, it takes advantage of the elasticity of its balloons to perform acrobatic stunts and jumps.
I think that's all the info there is right now.
There is a bit more info in the Japanese trailer. https://www.youtube.com/watch?v=2r0_F-_ClcQ
You will apparently be able to pick what your character looks like, similarly to X/Y.