Do we already know whats behind the ???
Is it Zyagrde's core?
And when are those supposed to be released? Wasnt it November?
Poison eevee to counter the fairy type ? Or possibly dragon but I doubt it :/ what makes me think that it would make sense to introduce a new evolution of an old Pokemon as all the starters are there ... Can't be mega mew ... But it feels like they want to introduce a new "cute" Pokemon to go with the rest... Perhaps a new baby Pokemon ...
It's not a new Pokemon, they do this shit all the time with this sort of thing, reveal a set then have one secret special rare one. It doesn't mean it's a new Pokemon.
The text says the set features the Kanto starters to celebrate the 20th anniversary of the series, which is in 2016.
And no, the final Pokemon has not been announced yet. As others have said, it's most likely Squishy.