Just a few hours ago aired in Japan the show "Oha Suta" and well, they revealed a new feature of the Pokemon Black and White Versions, the Live Caster!
If you have a DSi, Live Caster will be able to use for you and will let you have Live Chats with your DSi! If you are near with your friends, it will be able to cast 4 people at the same time, but if you are in Wi-Fi, it would be only 2.
As a side note, you can draw on your friend's face while you are talking with him, and he/she will see it as well! xD
A nice and creative feature that I didn't expected from Pokemon and Nintendo itself.