In the new update, avatar images (placeholder icons) for broadcasts, individual profiles and groups with gray backgrounds are appearing. WABetaInfo The report states that it will be visible to the user only after enabling Dark Mode. By default, on WhatsApp, the avatar image has a dark green ribbon matching the top with a green background.
WhatsApp is in the latest beta version of Android with a new avatar image as well as a new VoIP screen with Dark Mode support. Like the current VoIP screen, the new screen also has a glimpse of the green background but you will get a slightly darker color to prevent eye strain.
As you said, the new changes will not be visible to the user at this time. You can get the latest beta version of WhatsApp for your Android device. Play the Google beta program Or you can go to the APK mirror and download the APK. A glimpse of the WhatsApp Delete Message feature was found last week. This feature allows the message to automatically disappear after a user-defined timeout.