This image has appeared in several japanese forums and shows what appears to be a new Mewtwo form, and this may  be related to the fact that the japanese magazine CoroCoro promised news on the news about pokemon on the next issue, and the fact that news about the next-generation may be shown saturday on the Pokemon Smash TV Show.



Update: Another image


Source: http://serebii.net/index2.shtml

UPDATE: Pokemon Smash confirmed today that the new pokémon/form is official

I wouldn't have believed it, but... that looks pretty legit.

For some reason it looks almost exactly like this banner...

Where did you get that banner?

EDIT: already saw, that's the banner of the last movie, man, someone fooled serebii, that fooled me, now I think it's fake. Too bad, I thought we would see some mewtwo love again.

Not sure to believe or not. I wouldn't like it though.

From all over the internet. It's from the next Pokemon Movie featuring Genesect and the return of MewTwo.

Yeah, I saw, sorry, I edited my post.

I can't believe Serebii actually posted that. They don't seem to be the type of site to post totally off-the-wall rumors like this one!

MewThree?

Yeah, that's why I thought it had a chance to be true....