Nintendo finally announced their first mobile game. It is called Miitomo. With that announcemnt, they also announced that it is delayed to March 2016. They are aiming for a worldwide launch. Wall Street Journal live blog describes the game:
In the new Miitomo game, users will design their own avatars, or “Miis,” to communicate with other users. Executive Shinya Takahashi says that Nintendo will find ways to encourage people who are hesitant to talk to share things about themselves.
EDIT: Nintendos official reason for the delay:
On the reason for the delay of the smartphone app, Mr. Kimishima says, is the need for more lead time to fully promote and explain Miitomo. The company is busy promoting other titles in the pipeline right now, he says. It will start promoting Miitomo after the year-end holiday season. Says this will have little impact on earnings.
Source: Wall Street Journal Live Blog