Nintendo is sending out the following email to those who have a Nintendo Account. Looks like some changes have been made to Nintendo Accounts to expand what games you can play online.
"We are excited to announce that a Nintendo Account may now be used to play games that are not published by Nintendo.
You set up an account for your child and we want you to know that, when your child uses their Nintendo Account to play third-party games, the publishers of those games may have access to, use, and store your child's information.
If you would like to manage which third-party games can access and use your child's information please visit the parental control settings in your Nintendo Account.
If you have any questions or for more information on Nintendo's privacy practices, please visit support.nintendo.com.
Nintendo of America Inc. Consumer Service Department"