I hope they keep the iPad mini. It is used widely in aviation as it's the only one that is small enough to be yoke-mounted. Just about every pilot I know (Part 91/135 and even some 121) uses a mini to keep FAA charts and approach plates.
Forgot about the mini, there are rumours about a new model so certainly I can see them sticking with this as it is a product with distinct use cases as you say.
I would also expect it to work with the Pencil 3 which will have USB C charging