Miyamoto says that the fifth Nintendo mobile will not be released by March 2017

This comes also from the TIME Miyamoto interview...

In a followup email asking about the number of mobile games planned by March 2017, Miyamoto added: “We’ve consistently stated a plan to launch approximately five mobile apps by the end of this fiscal year, including Miitomo. Given market conditions and the development process for each title, our current plan is to launch four total mobile titles in that period.”