Miitomo will be Nintendo's first smartphone game, to be released next March
Earlier this year, Nintendo did hint that it would go into its stable of famous video game characters for its smartphone games. At the same time, the company also made it clear that it would not simply make versions of its console games for smartphones. While Miitomo won't use any Nintendo characters, there is speculation that the company is holding back, waiting to see if it can be successful on this platform before rolling games using its popular icons like Mario.
Nintendo also announced that it will offer a service called Nintendo Account, that will connect its consoles with PCs and mobile devices. Users will be able to transfer data via a cloud based service. As we get closer to March, we should hear more information about this and Miitomo.
source: Nintendo (translated) via WSJ