According to the images, the new case can receive holes for speakers, a hole for attaching a microphone and a strap. This means that the headphones can be attached to something like a bag. This will make them easier to transport.
The new charging case is also expected to get Find My support and allow users to track their location in the iPhone app. Earlier this year, analyst Ming-Chi Kuo said that the case can make noise when lost, which would explain the addition of speaker holes.
A microphone, on the other hand, can be used to pick up sound and make conversations clearer, for example, if someone is in a noisy room.
Source: Ferra
