As of 9/10 (Mon), Version 15.1.1 has become available for Android users.
As this is a minor update containing small adjustments, bug fixes, and no server maintenance is required. Users will not experience any downtime.
For more information on the Version 15.1 update, see here: https://bit.ly/2MYALPm
This update will become mandatory after 9/11 (Tue), 6:00 PM (UTC-8). You may install this update using your device’s normal procedure (through the App Store).