The existence or lack of the audio jack is still surrounded in some mystery. There are rumors that suggest that suggest that Apple won't ditch the audio jack just yet, others seem to be certain that the iPhone 7 won't have one. I would say that for now, the company will keep the audio jack, given the fact that many Apple fans would be extremely disappointed if they couldn't use regular headphones with their iPhones.

Probably not

I also believe that Apple will surprise us with some extra features, if they want to justify the price difference.

Oh and I thought the PRO stands for protein :p .... of course the pro version is going to have some extra features mate.