Nintendo's social app Miitomo is launching on March 17th in Japan
What about Mii?
Nintendo's first "game" (or rather social app) Miitomo is launching on March 17th, the company announced on Twitter yesterday.
Miitomo is planned to be a social hub to talk and exchange with your friends. It utilizes Nintendo's new account system. Nintendo's second app, planned for later this year should be a game that will feature one of Nintendo's well known IP.
If Miitomo is launching this month in Japan, you should expect a worldwide launch pretty soon. We'll keep you informed when that happens.
[Source]