This is a pure server-side improvement and you would need to get into the room with 3+ people and start talking at the same time to see the difference. Now you will be able to hear all participants with an equal level of sound.
At the same time, on the Android app, you can notice some popups that promote enabling a chat bubble for voice chats and Discord's recent screen sharing feature. It seems that Discord is also trying to catch up on the Voice-trend hype train.
Via @Discord