Quoted By:
1. Facial hair and more detailed customization options
2. Name character limit has been extended past 8 spaces
3. Abilities of several pokemon, Skiddo has sap sipper, bunnelby has one where he heals whenever he uses a berry in addition to the berry effects, pancham has iron fist, can't remember any other new ones we saw.
4. Berries grow on trees ingame
5. There are a fucking lot of pokemon from gen 1-4 available in the early game
6. Fletchinder, midstage between fletchling and talonflame was revealed, Espurr, which was already leaked, was confirmed.
7. HMs confirmed to be around as usual, unchanged BP on cut.
8. Venusaur and Blastoise do not get version exclusive mega evolutions, of the Kanto starters, only Charizard's mega stone had an X/Y in the name.
9. Infestation, new bug type firespin, some new Fairy type moves leaked as well
Lots of little stuff, nothing huge.