I think the reason they included the bumper for the battery is because the L shaped batteries have the controller board on a different side so it needs something to help cushion it just like on all the models with L shaped batteries

I want to see if the display chip on the pro model is actually 120hz capable and if the one on the non pro is different. It would be neat to see if Apple actually put in everything necessary to activate 120hz later since the pro panels I believe are capable. Also it would be cool to see how they improved water resistance this year yet again. And maybe seeing if they added any better thermal dissipation system since the 5g chips are gonna get a lot hotter than previous chips and plenty of android phones have had really good cooling for awhile.