Dilan Roussel of 9to5 Google recently discovered that the internal application uploaded to Play Store was designed to test the application's internal comment system. The following screenshots can be used for the entire operation:
The interface that incorporates Material Design design elements looks very easy to use. Users don't need to jump to Play Store to score and leave a message for the application. After the operation is completed, notifications of comments received will be displayed. For now, the test application does not seem to receive any sign that it has been audited - of course, this may change when public builds are released.