There hasn't been a single Apple product in the last few years that added features without increasing the price.
Well there was the 2018 iPad, but yes I too expect an increase not just because, but due to the addition of FaceID and change in form factor to thinner bezels.
I have this crazy feeling that the new iPad Pro will be at least one giant step closer to being a more useful PRO tool. I am betting my dad $.25 that it will have mouse support of some type. I hope I am right. I need the money!
LOL good thing the bet is so little given that iOS 12 is already out and if such support was being added it would have been found locked away in iOS 12’s code by now.