The official Pokémon YouTube page has posted a trailer for the upcoming new English dub season Pokémon BW: Adventures in Unova which will begin airing on Cartoon Network on February 2nd, 2013. Below is the trailer and a season description. The trailer contains spoilers.
Ash and his friends Iris and Cilan have foiled Team Rocket's latest evil plan, but a new danger lurks on the horizon! But first, with eight Gym badges in hand, Ash is ready to take on the region's ultimate challenge: the Unova League, where he'll face familiar rivals and new opponents in his ongoing quest to become a Pokémon Master.