Tonight Nintendo has first released their Miitomo app exclusively to Japan, however the app apparently already has a full English translation.
Unfortunately it does not appear to run on rooted devices, as reported by a few users here. One user reported success with RootCloak, however others and myself have not had such success. I have a Galaxy S5 with CyanogenMod 13.0. The app starts with a black screen for a second before crashing back to the home screen. Tried clearing any cached data for the app. Any other ideas?