Blizzard have recently revamped their Account Management page and now you are able to link your Nintendo Account to your Blizzard Account on the Connections page!
Some small but important changes will be coming to your Nintendo Switch soon.
From May 15, 2018, Nintendo Account members can now create or join a Family Group.
During the holiday season Nintendo has received many questions and inquiries concerning Nintendo Account and Nintendo Network ID from Japanese consumers.
Nintendo Account is an all-in-one login for Nintendo services on Nintendo Switch and smartphone devices.