This latest trailer revealed yesterday on Pokémon Sunday shows off a heap of new Pokémon B&W goodies: namely, eight new Pokémon, three-on-three battles, and a Japanese release date of September 18th.
Triple battles are a first for the series, with two-on-two double battles having previously been introduced in the third generation with Pokémon Ruby & Sapphire. Judging by the video, moves like Surf will still hit the entire field, so this just means you'll have to be extra careful in these fights - and double battles are tricky enough already!
We also see a character who may well be the new rival (the green-haired trainer with the baseball cap), and get a look at the new battle presentation. From the admittedly little bit we get to see of the battles, they look a lot more dynamic than in previous versions - the Pokémon themselves have idle animations, and the camera zooms out and in alongside attacks.
It's still the same strategic turn-based combat we know and love, and I wouldn't have it any other way, but at least now it looks much more exciting.