Sign up now for Nintendo Account... In Japan.
Yes, Nintendo Account has opened up for Japan gamers and an ad has also been put out underneath the article describing the new account service for the two upcoming services, the Miitomo app and My Nintendo. Great for Japan, not so great for here in the US to sit around and wait until we get it, at least this shows us that IT WILL BE COMING, all of it.
"If you do not have a game console, it can be registered from the smart phone or personal computer. In addition, and "Nintendo Network ID", such as account of SNS (social network service),(Source)
cumbersome input item without any Guests may immediately register.it is possible to work with account of the available services."~Roughly translated by Google