If you are looking for some new Pokemon Black & White screenshots, you can find plenty of new screens over on the official website. The three tabs on the bottom of the page show screens for the new town, characters, and starter pokemon.
On the bottom far right, you can also find more screen shots of the first Pokemon that was announced. It appears that his new move, Illusion, will allow him to disguise himself as Raikou, Entei or Suicune.
Again, you can check out the screens over on the official website.