Illustration from the patent application showing the Apple Music app on the AirPods charging case touchscreen
Tactile outputs help improve the user experience and could alert the user to an impending event that will take place unless an input is made on time. Illustrations in the patent application show how the case will be able to interact with iOS apps like Apple Music, Apple TV+ Messages, Maps, Weather and more. The user would hear, for example, turn-by-turn direction from Maps through their AirPods. Messages would be read to the user through his/her AirPods as would weather forecasts, streaming video content, phone calls and more.
Of course filing for a patent, and even being granted one, does not guarantee that Apple plans on using the technology, processes and ideas that the company seeks to protect.