Honestly, the OP is asking a question that we have no way of actually knowing the answer. We’ll know the same day the OP does. I’m excited for it and hoping for a new design ASK.
the only 'new design' I'm hoping for is functional changes. I don't care if it looks exactly the same as the current ones. the argument that the look must change every couple of years is bunk to me.
the kinds of things I want to see in the iPads, especially the pros are:
better screen with a graphics system that can support 4k HDR viewing
more storage, honestly if they want to really push this Pro thing they need to find a way to get the storage up to a solid 1TB
better response for drawing etc, especially when they are pushing drawing as a key use for the iPad and pencil combo in their own stores.
a smart connector on the Pros that doesn't lose connection to the keyboard every couple of months and with it a keyboard that doesn't have keys go out every couple of months
a Pencil that can have changing tips to something a little softer, or more of a nib or a brush etc as we want to use them.
things that would be nice to have but aren't vital in my book
face ID and all the animoji stuff
wireless charging for the iPad and even the pencil.
losing the bezel for a slightly bigger screen
iPad mini 5 with pencil support similar to the iPad Air 6