Pokémon X & Y -
Japanese variety show, Pokémon Smash, has started showcasing the various Pokémon X & Y information. Firstly, they have shown the Mewtwo form has been officially confirmed, though it wasn’t officially stated to be Mewtwo at this time. We expect localisations soon, as well so keep checking back
~http://www.serebii.net/index2.shtml
Wow… they don’t know what it is. Mewtwo’s baby form? Mewthree? An alternate form of Mewtwo. I WANT MORE DETAILS.