The first app is an Augmented Reality game called Pokémon AR Searcher. This app allows you to use the camera on the Nintendo 3DS to search around and capture Pokémon that can be transferred over to Black and White 2. This will be released alongside Black and White 2 for approximately $3.50.
The second new is Pokedex Pro and is an updated version of the existing Pokedex app for the 3DS. It will include new features and be released on July 14 in Japan for 1500 yen or approximately $18.
Set two years after Pokémon Black and White, Black and White 2 features a Pokédex with about three hundred Pocket Monsters. The game begins in a new location called Hougi City. It's still located in Unova. The game will follow two new trainers, with a new rival and new gyms.
Pokémon Black and White 2 is slated for a June release in Japan. It will be out this fall in the West.