A bunch of new Pokemon X and Y information has come out of the new issue of CoroCoro, but my attention went straight to the following: Mega Garchomp. Yes, the crazy dragon/shark/jet-looking Pokemon has a Mega evolution. Game Freak knows how to please a crowd.
Other details compiled by PokeBeach include yet another version of Mewtwo, called Mega Mewtwo X (the previous design is now seemingly Mega Mewtwo Y); the evolutions for the Kalos starters Chespin, Fennekin, and Froakie; a Normal-type called Torimian; a Psychic-type cat called Nyaonikusu; and two fossil Pokemon, Chigorasu and Amarusu.
I must have that Tyrannosaurus rex Pokemon. And although I almost always go for the Water-type starters, I'm now leaning toward Chespin. We'll see, though.