For me reverse wireless charging would be a huge gain in the new iPP. You could leave the house for the day with no charger or maximum one for all your devices.
Problem is MagSafe doesn’t make a lot of sense in an iPad in a lot of scenarios - if you want to charge your iPhone with it you don’t want it screen down on a table, and a glass back sounds pretty silly for an iPad. If we get MacBook MagSafe that seems very non-Apple to simply add ports and would not be an elegant implementation as you’ve still got a cable sticking out the side.
I hope we see a new Magic Keyboard that uses the new 4-pin connector to enable the case to become a MagSafe charger, both to charge the iPad while being used, freeing up the Thunderbolt Port and also to charge your other devices via reverse wireless charging when needed. Makes for a more elegant solution but obviously means you need the MK case to gain the feature which suits Apple’s desire to convince people to upgrade their kit!