According to a tweet by VentureBeat’s Jeremy Horowitz, the FCC filing for the iPhone 12 makes mention of a possible latent reverse wireless charging feature in the handset. “In addition to being able to be charged by a desktop WPT charger (puck), 2020 iPhone models also support WPT charging function at 360 kHz to charge accessories [including] an external potential apple accessory in future.”
https://twitter.com/horwitz/status/1321246682772697089
Reverse wireless charging isn’t exactly a new feature and we’ve seen similar capabilities in other smartphones. However, the tech is iffy at best as it is usually too slow to be of any real use. However, some are speculating that the reverse wireless charging feature isn’t really for charging higher-powered devices like another smartphone, but possible future unannounced Apple MagSafe accessories.
Some believe that this could apply to future versions of the AirPods, where users might actually be able to use their iPhones to charge the earbuds. Apple already sells wireless charging cases for the AirPods, so this idea isn’t really that much of a stretch.