Starting today, you will be able to lock in your new Nintendo Account username and pre-register for the company’s first mobile app, Miitomo. Registration on the official Nintendo Account website is as simple as using an existing login or account info, and will be required for future Nintendo products.
Club Nintendo is no more, but My Nintendo will exclusively use the Nintendo Account service when it launches. Games, systems and apps like Miitomo will allow players to keep track of their progress and unlock rewards. Not many details are known yet, but per-registering for Miitomo will earn you a bonus platinum point when the app launches.
My Nintendo Platinum Points earned via preregistration will be available when My Nintendo launches by signing in to your Nintendo Account and visiting the My Nintendo website.
Outside of that, signing up now for Miitomo won’t do much except an email alert when the game is ready.