Newtwo is a Pokémon. It is also new. I hate to be a pessimist, but it wouldn't be the first time a new form was advertised as a "new Pokémon". Having said that, I really hope this:
My Guess is that will reveal
Slyveon's new Type
Is what it turns out to be. As a huge Eeveelution fan I was extremely disappointed by Sylveon so I'm really hoping we get at least one more. And I'm sick of all the speculation and arguments about Sylveon's type. I just hope they don't reveal another ambiguous Pokémon without disclosing its type. We're already missing types for half the revealed Pokémon, they need to give us a break.
Gen Sixers: Uno Hoennbabbies: STRANDED IN MICHIGAN!
Actually if the new forme is part of tomorrow's news, then it might double as news of whether or not you can transfer Pokémon. Like maybe we'll have an event Genesect or Mewtwo that unlocks Newtwo for X and Y in the same vein as shiny beast trio unlocking Zoroark in BW and Keldeo unlocking his own event in B2W2.