Nintendo published the first trailer for Pokémon Black/White Version 2 for DS. It is set within the Unova region after 2 years from first Pokémon Black/White. It will has new playable characters and new rivals. Pokémon Black/White Version 2 will has more than 300 Pokémon and it will contains Pokémon from various other regions of the game which is making it the biggest regional Pokédex.
some of new pictures from the game: