Here is a snippet from and interview done by IGN with Motomu Toriyama the director of Final Fantasy XII: Revenant Wings.

 Do you have interest in using the microphone or Wi-Fi in future DS titles?

Toriyama: We’re definitely interested in the multiplayer and local connection element. And we’d like to look into it for the future. We don’t know about the mic function so much because it might not be too convenient if you’re playing on the train. Right now we’re mostly interested in Wii Fit. We’re really intrigued by it.

There is a lot more to this interview so check it out HERE