Pokemon Sun and Moon information has been officially revealed! The Grass starter to me seems to be best described as a green rufflet. It is a grass and flying starter and has a new grass move when you get it. I can't remember the name, but it looks a lot like razor leaf. The fire starter is best described as an emo litleo. Its basically a fire kitten. Pretty simple. The water starter is a sea lion. Kinda looks like a baby samorott.

Gameplay of the region has been revealed. It looks like the towns are pretty big. The battle graphics aren't too different from ORAS and XY. The region itself seems to be pretty hilly and mountainous. It also seems they brought back customization of your trainer.

The legendaries have not been officially named but they are shown in the trailer and the box art. The sun one looks like a Mega male Pyroar. The Moon one looks like a mega noivern/crobat.

For all the information check out Pokebeach.com.