During Shigeru Miyamoto's Keynote at the Game Developers Conference, Mr. Miyamoto touched upon a program he created for the NES that could be used to animate faces, and it being halted.
Consequently, he explained that years later Mr. Iwata approached him, telling him they had a team working on a 'face creation' game for DS. Miyamoto told how he was frustrated he hadn't managed to do it himself.
We're unsure quite what this means as of yet, as no further details are available. An expansion of the Mii channel for the DS? Perhaps.
Be sure to check out our live coverage of the event in question, here.