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They revealed two new Pokemon - one named Noviern, who uses a new attack called Boomburst, and Vivillon, which knows Struggle Bug.
The Fairy type was officially revealed! Sylveon, Gardevoir, Jigglypuff, and Marill are all Fairy-type.
Sylveon knows a new move called Moonblast, a Fairy-type move.
Gardevoir can learn Fairy Wind.
Fairy is super effective against Dragon. This matches what our source told us.
There will be a new Pokemon interacting feature called Pokemon-amie, which allows you to bond with your Pokemon by petting them, feeding them, and play with them to "deepen the connection between you." You can copy the actions they're performing with your 3DS to make them even happier.
Old Pokemon still have their old sound effect cries.
Apparently there's a new way to encounter wild Pokemon - "Whoa! The Heloptile you stepped on attacked!"
X and Y will be released on October 12th.