With Pokémon Black Version 2 and Pokémon White Version 2 headed to gamers eager hands (with just a quick detour into shops) on October 7, Nintendo still has a little time to leak out bits and pieces of information regarding the DS sequels (also playable in 2D on a 3DS, naturally) leading up to launch.
One of the new features in Version 2 is called Join Avenue. This is a new area in the game populated by anyone you've tagged, traded with or battled. These other players will open shops in Join Avenue that sell rare items not found in the main game, including supplies or power-ups. And the more populated your Join Avenue is, the rarer the items are that will be sold, so make sure you play well with others!
The other new feature is called Memory Link, and if you've already played Pokémon Black or Pokémon White, you'll be able to see what happened to some of the characters from the first game in the two years leading up to the events of the sequel. Obviously the scenes you'll encounter will depend on how much you've played through the original games. But you'll also be able to capture special Pokémon. Which is good, because using Memory Link sounds like it might be complicated, since you'll have to either link two DSes together, one with each game, or sync your Pokémon Black or White game to the Pokémon Global Link website, and then go online with the sequel.