http://nintendoeverything.com/new-nintendo-membership-service-is-nintendo-account/
SPECULATION FOLLOWS
This will probably be integrated into the NX (Whatever that may be). This also seems to feed into the whole "Hybrid" console thing.
During its financial results briefing, Nintendo touched on its new membership service being created by DeNA. Today, Tatsumi Kimishima revealed the name as “Nintendo Account”.
This information comes from the Wall Street Journal:
Nintendo’s new membership service will be called “Nintendo Account” — it will connect hardware users, as well as PC and smart device users, Mr. Kimishima says.
Kimishima also revealed that the company has plans to use a cloud-based data service to transfer game data between mobile games and console titles.
SPECULATION FOLLOWS
This will probably be integrated into the NX (Whatever that may be). This also seems to feed into the whole "Hybrid" console thing.