SO FAR, the only region starters you get are the Kanto (Bulbasaur, Charmander, Squirtle) and the Kalos starters (Chespin, Fennekin, Froakie).
I say "so far" because there will be WiFi events allowing access to other region starters and other rare Pokémon, like the Event Torchic (Gen3, Hoenn region Fire starter). Maybe Nintendo will release others in the near future, but we currently have no idea.