I see some interesting possibilities:
- Apple will not develop a pressure sensitive stylus for either the iPad or the iPad Pro, instead they will make the screen pressure sensitive, which the UI will implement in ways beyond just graphics editing.
- The A9i CPU will have one, or more, Intel cores, or hardware logic for direct emulation of x86-64, so that apps that are not compiled for ARM will run on it.
- The lower border of the bezel (where the home button is) will be 2.5 times as wide, in order to include an outlined rectangle that can serve as a trackpad for times when touch is problematic.
- The Finder designed for iOS will also be available for the Air and mini lines, if you want to pay the extra $100.us for it. This will include the ability to transfer files using the Pro's SD/microSD card slot (but not the separate camera card reader device).
I already have a fine keyboard/case combo, so no one actually needs to develop one of those.