"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," the filing reads, according to Horwitz.
While mere speculation, the feature as described could enable charging of attached MagSafe accessories, including unannounced devices like a next-generation AirPods product.
At the time, TF Securities analyst Ming-Chi Kuo predicted that year's iPhone — what would become iPhone 11 — to feature "bilateral" wireless charging.
Today's discovery suggests Apple continued work on the charging feature and integrated functionality into its MagSafe protocol.
In theory, reverse wireless charging could be activated via a software update, but it remains unclear if and when Apple intends to do so.
I can foresee an MagSafe Apple Battery pack that when attached can be charged via this feature thru the iPhones Lightning adapter
Most likely the external potential Apple accessory in the future is the Apple AirTags
iPhone 12 boasts latent reverse wireless charging feature, FCC filing suggests