UPDATE: How about a Smart Cover or Smart Folio that draws power from the iPad and has embedded Qi charging coils.
You know what, that, with some minor additions, would basically fix the Apple charging ecosystem problem I have been complaining about to myself (needing too many cables, power bricks, etc), and it would be even better than an Airpower would have been. What I want is to have the Smart Folio with 4 charging coils, 1 for Watch, one for iPhone (7.5 watts, or possibly 10 watts for a future iPhone), 1 for Airpods, last one for an Apple (or Beats) over the ear headset. 3 coils could run at 5 watts, and the other 7.5-10 watts. The Watch would be non-standard, but the other 3 should be Qi so it could work with other non-Apple devices. What it really needs though is to have an adapter for the cover connector, so that you could take the cover off the iPad, pop in the adapter and plug the adapter to the power supply (hopefully USB C for the adapter), then you can use the iPad while the devices are charging, or you could keep the iPad cover on and charge with everything being unused while charging (probably doing this overnight). If you want to charge everything at once, including the iPad at full speeds, you need a 45 watt USB-C power supply or better.
Wow that would be great! I would only then carry the iPad, the cover, the adapter, USB-C cable and power supply, and the 4 devices (minus any laptop, etc), and I could skip out on Lightning cables, more USB-C cables, and microUSB (the Beats headsets use microUSB today).