Preregistration for Miitomo is now open, and in multiple languages, including English. Nintendo Account registration opened up a few hours before preregistration for Miitomo opened up, and if you signed up already, then it's just a couple of clicks to sign up. Nintendo also revealed that the currency you'll earn is called My Nintendo Platinum Points, with points awarded for preregistration and redeemable for rewards through My Nintendo, which launches with Miitomo. Those preregistration points will expire after 6 months, though. Still, we can hope for some cool prizes.
The other news is that Nintendo says that Miitomo will go live in March, and the game is described as "free to start." It's not even really described as a game by Nintendo, just as a "smart-device app" but any move by Nintendo to mobile is worthy of note. The website shows off some of the features of the app in English, so you can see more of the game for yourself on the official site.
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