I don’t see Apple increasing megapixel counts on the cameras, especially since they just introduced a new 12 megapixel sensor in the pro max with larger pixels. I think the camera updates will be all phones get the larger sensor (except maybe the Mini because it literally doesn’t fit, that might get a custom sensor that is as big as they can go in that form factor), the regular sized Pro gets the 65mm telephoto lens and sensor shift on the wide angle lens, the non-Pros retain OIS. The max will get new ultra wide and telephoto sensors, not as big as the wide camera sensor but still better than what we have now. The alternative would be all the phones get new sensors and the max gets a fourth camera at an actual 5x focal length.
The pros will get 120hz screens. I hope TouchID finally returns, either under the screen or on the power button. I’d love to see options to use either TouchID or FaceID and the option to use both in tandem for added security. I’d also like to see Apple find a way to address masks with FaceID. If anyone can figure a way around that problem, it’s Apple.
5G will be improved, perhaps enough that they don’t have to switch back and forth between that and LTE. Between that and 120hz screens though, any battery gains will be invisible and seen as the phones retaining the same battery estimates as the 12, or slightly worse.
I’d love to see feature parity between the pros return personally. The A15 should be a monster chip. I suspect RAM will remain the same, maybe the non-pro models will get the bump to 6 GB as they will get the inevitable feature trickle down that tends to happen, such as Dolby Vision at 60 FPS and the ability to handle ProRAW.
I’m sure Apple will still have some surprises for us. I hope it’s mainly a focus on improving much of what they’ve introduced this year as I find the s models to generally have the best longevity. I got a 12 this year but I can’t see it being a long term phone.