Mewthree?

Nintendo has recently released footage of a new Pokemon in Pokemon X and Y!  It looks almost identical to Mewtwo, which is why it leaves me to believe that it is Mewthree.  It proably isn't called Mewthree, but I can dream.  In the footage, you can see it fighting Genesect, Rampardos, Cloyster, Gyarados, Machamp, and Zangoose which confirms their inclusion in the game.  This Pokemon kind of looks like a cross between Arceus and Mewtwo.  The long mane Arceus has looks a lot alike the mane "Mewthree" has.