Spoilers for X and Y
http://pastebin.com/jbZBuPbL -A racing minigame. You can ride pokemon on land, sea and air.
-Gogoat has two versions, the trailer one is a male. There is an unridable female without horns, apparently visible in the edge of the trailer.
-The final evolutions will look like this:
Chespin will look like an (American) football player, with helmet and protection. Fennekin will have large ears that look like bat wings/cape. He looks like a flying Zorro. Froakie looks like a ninja from a Japanese painting.
-There are more new pokemon introduced than in Gen IV.
-Sylveon is Eevee's only new evolution.
-Clefairy, Togepi, Jigglypuff, Chansey, Lickitung, Snorlax, Dunsparce, Audino, Snubbull, Skitty and Whismur, and their evolutionary lines are Fairy.
-Mawile, Absol, Misdreavus, Milotic (not Feebas), Chimecho, Uxie, Mesprit y Azelf are half Fairy.
-Mawile has an evolution with 2 mouths instead of one. Apparently it looks like a horse's tail? It might be a reference to Hastune Miku (?). It learns quiver dance, a bug move.
-Eevee, Mawile, Sableye, Dunsparce, Bannette, Tauros, Heracross, Pinsir, Bisharp, Maractus, Cryogonal y Drifloon have new evolutions.
-Lickitung, Throh/Sawk (shared?) and Absol have pre-evolutions.
-Drifloon's new evolution is an alternative to Drifblim and is ghost/fairy.
-There are 2 new teams, Team Acid and Team Base.
Acid has 'punk rock' motorcyclists who want to experiment on pokemon to create the best one. Their leader is a long haired woman. Their important members are 'admins' and they use poison pokemon.
-Team Base are less evil and more misguided. They wear Tai Chi clothes and want power to protect what is important for them. They steal weak pokemon from trainers to make the pokemon strong. The leader is an old man, (with a muscular white horse?)