I don't think they will have a 7.9" iPad Pro. And it's too early to bring the 10.5" display to the consumer iPad.
The 9.7" display was already deemed small for Pro users which is why they are bringing in 10.5". Apple could have a done a 9.7" thin bezel if that's what pro users wanted. A 7.9" tablet leaves no room for a Smart Keyboard or real productivity.
9.7" is too small and yet people have been writing in books and notepads smaller than that for years? I would personally love to see a Pro iPad Mini and hope it may launch this month but I have to agree that there doesn't seem to be much love in these forums towards the iPad Mini size or within the rumours.