The always-intrepid Mark Gurman, reporting for Bloomberg:
An executive at an Apple partner that manufactures third-party wireless chargers for iPhones, who asked not to be identified, said that the multi-device charging mechanism is challenging to build because it likely requires different sized charging components for the three types of devices, which would all overlap across the mat.
The AirPower charger is also more advanced than the current competition because it includes a custom Apple chip running a stripped down version of the iOS mobile operating system to conduct on-device power management and pairing with devices. Apple engineers have also been working to squash bugs related to the on-board firmware, according to the people familiar. They asked not to be identified discussing a product that hasn’t been released yet.
AirPower's failure to ship after close to a year must frustrate Apple executives. As for my expectations, I'm not particularly hankering for it at home. Where I think I'd definitely like one is for travel—the ability to simultaneously charge my iPhone, Apple Watch, and AirPods would relieve me from having to pack a trillion cables and charging stands in my baggae. I've been meaning to buy second sets of chargers to set aside specifically for travel, but buying one AirPower mat may be a better solution.