Interview with DeNA CEO Moriyasu confirms that Nintendo's Miitomo is an app for chatting
Miitomo will work with Nintendo's new membership service, and eventually there will be five games (mini-games according to Moriyasu) that users will be able to play. The CEO characterizes the title as a game that can be used to "communicate with friends." This communication is done using avatar-like Miis that users can create in their image. Because it is not totally a text-based communication tool, conversations look and feel different.
Those using Miitomo will be able to purchase clothes for their Miis, which is one way that Nintendo plans on monetizing the game. The video game company has some pretty big names as partners in the project, including Bandai Namco and Disney. Considering that both firms don't get involved with something that doesn't have the prospect of making huge profits, it would appear that there are high hopes that this will succeed.
Nintendo plans on marketing the app in the beginning of the year, and it will be launched in March. It might not be the red hot smartphone game that everyone was hoping for from Nintendo, but it is a start.