Nintendo opened registration for Nintendo Accounts last night, and now Miitomo has been opened up for “pre-registration” as well. By pre-registering. you will get an email notification when Miitomo becomes available. Perhaps even more interesting is the fact that by preregistering with a Nintendo Account, you earn My Nintendo Platinum Points. My Nintendo Platinum Points are part of the My Nintendo rewards program, which Nintendo confirms will launch at the same time as Miitomo. These Platinum Points can be exchanged for digital content and original goods. My Nintendo Platinum Points earned via preregistration will expire 6 months after the launch of My Nintendo.
Pre-registration ends at the launch of Miitomo. Miitomo is a communication app for Android and iOS launching March 2016.
You can pre-register here!