The new charging case will allow not only charging via a USB-C cable and a power adapter, but also from a USB-C-equipped iPhone.
Apple AirPods Pro 2: Our Honest Review - CNET
AirPods Pro (2nd generation) with MagSafe Charging Case (USB-C) - Apple
Apple intros standalone USB-C charging case for AirPods Pro 2
Do the New USB-C AirPods Pro 2 Sound Any Better? - CNET
Apple introduces the new AirPods Pro (2nd generation), also now with USB-C charging
A USB-C variant of the AirPods Pro 2 might launch soon - PhoneArena
Airpods Pro 2 USB-C Authenticity check : r/AreMyAirpodsAuthentic
AirPods Pro with USB-C are supposedly on the way - The Verge
AirPods Pro 2 rumored to get Apple's first USB-C charging case