Mega Mewtwo has 2 Mega Evolutions, “Mega Mewtwo X” which is X version only is Psychic/Fighting with Steadfast as ability. “Mega Mewtwo Y” Y version exlusive, is Psychic only and can learn Hypnosis.
Mega Garchomp keeps its typing and now has Sand Force as ability.
Chespin’s evolution is Grass-type only and can learn Mud Shot.
Fennekin’s evolution is Fire-type and learns Psycho Cut.
Froakie’s evolution is Water-type and can learn Bounce.
New Fossil Pokemon: Chigorasu the T-Rex is a Rock/Dragon-type with a new ability called called Hard Chin (increases the power of moves that uses its mouth). Amarasu the Brachiosaurus is a Rock/Ice-type with Freeze Skin as ability (it changes the type of the normal-type moves it learns and they become ice-type increasing their power as well).
Torimian is the Poodle that leaked during the Direct, and is a Normal-Type pokemon with Fur Coat as ability (Cuts the damage or physical moves directed at it), you are able to style it by cutting its fur and even painting it. Nyaonikusu is a psychic-type cat with gender differences, the female is the white one with yellow eyes, and the male is the one with blue eyes. They will have different moves and even stats with Keen Eye or Infiltrator as ability.
Team flare has 5 admins: Kuseroshiki, Momiji, Bara, Akebi, and Kolea. And they want to create a beautiful new world.
There’s a table with the typing of a few new moves, and Parting Shot, Geomancy, and Oblivion Wing are listed as unknown types (???).
A new character called Karune is an actress that helps you to customize your clothes and hair at a Salon/Boutique. And you can also battle her.
In the anime, Gym Leader Clemont, and the female playable character are next to Ash in the poster. Clemont seems to have a Dedenne. Mega Blaziken featured as well.
The first XY TCG sets are called Collection X and Collection Y.