Google is removing the Google+ requirement from Google Play Games, and this means that users will no longer be required to sign with their Google+ accounts in order to play games. Users will also receive fewer permission requests as well as enabling themselves to log in only once per account (rather than per game) and be automatically signed in to any future games.
Google noted that most games shouldn’t need any changes from developers, but the company listed a few potential issues that the games would have, including an issue where pop-up consent windows will appear to unnecessarily ask users for the Google+ scope. Other issues include games that use Play Games player ID for other non-gaming APIs and using mobile or client access tokens on the server.
Google did not say when exactly they will remove the Google+ requirement from their gaming service, but it should be relatively soon.