Wait, does that mean he disconfirms MewTwo?
"Pic of the day. Remember the video that introduced Greninja joining the battle? Every Pokémon that appeared in that video will make some kind of appearance in Super Smash Bros!
By the way, here's one of the Pokémon that didn't make an appearance in that video--Meloetta. Its vocal attacks reflect off land forms, so they'll be especially effective in a closed environment."
Mewtwo didn't appear in the Greninja trailer proper, but like Meloetta, Mewtwo could still make it in the final product.
Plus, they're both genderless in canon (apparently), so this is all clear Mewtwo foreshadowing.
Then again, didn't Meloetta appear in the Pokeball showcase in the actual Direct?
*gets paranoid*