Pokebeach was contacted by a leaker who now appears to real, but he says to still take it with a grain of salt. The entire message is too long to post here so I encourage you to read this: http://pokebeach.com/2013/05/supposed-pokemon-x-and-y-insider-information
Fairy will be a new type. It is weak to Poison and Steel, immune to Dragon, and super effective against Dragon, Dark, and Fighting-type Pokemon. Sylveon is Fairy-type. Some older Pokemon will be reclassified to Fairy, such as Mawile (Steel/Fairy). Mewtwo has two new formes, not just one. Both are activated via items. The professor's English name is Patrice. The Starter final evolutions are, as many people predicted, Fire/Psychic, Grass/Fighting, and Water/Dark. The first Gym is Bug, the second is Fairy, and the fourth is Fighting. A few attacks will be dual-typed. There will be a new type of battling style that Flying-type Pokemon and Pokemon with Levitate can participate in. You will be able to see a Pokemon's EVs at a certain in-game facility. You will be able to boost the EVs through mini-games. It will take about two hours to get one stat to max EVs.
"The difference between fiction and reality is that fiction has to make sense." -Tom Clancy