The HomePod mini takes the best features of the HomePod and packages it into a smaller and more affordable package. Apple made the HomePod mini even better by turning it into an intercom with a new feature of the same name, which never leaked to the rumor mill.
Using Siri, you can send voice messages to other people in your house. You can broadcast a message to everyone or choose individual rooms that are equipped with a HomePod, iOS device, or Apple Watch. How great would it be to ask someone in the kitchen to bring you a fresh cup of coffee when you are stuck in an hours-long Zoom meeting.