Miitomo & MyNintendo are coming on March 31st (EU+NA)

[TomaTito]

Learn unexpected things about your friends with #Miitomo from 31/3 on iOS and Android! https://t.co/gR9GSSeeIx pic.twitter.com/oICcE7Cj0g

— Nintendo UK (@NintendoUK) March 29, 2016

Mii too [mo] called it.

TomaTito said:

When this was announced it was mid-March for Japan, during March for the rest.
Expect our update at the end of the month.

http://gamrconnect.vgchartz.com/post.php?id=7804804