If you count revamped cries as new ones (I think it's related to how the game treats Pokemon cries, since it appears that they're now more expressive depending on the situation).
Strange enough, wild Pikachu were actually common in that demo.
Well, some Pokémon from Gen I had exactly the same cries.
Rhyhorn has the exact same cry as Charizard in the games.
And those Gen I / Gen II cries sound a bit... strange, for a 3DS game, I guess.
Wait, wild Pikachu were common in the demo?
...
Maybe that was just for the demo?