It’s an interesting question. They have to have some reason to attract new and existing buyers.
It’s hard to imagine they could have a huge battery size to weight improvement. A Ti case really wouldn’t make the phone noticeably lighter, as the phone doesn’t have much metal as a large part of the weight anyway. So you save the equivalent weight savings in grams of 4 sugar packets for another $200 and apple has to have a whole other production line? I don’t know. Seems unlikely.
Ceramic, real raw we’ve carbon fiber options? Man it’s think they’d be brittle. Even the Ti would scratch more than the Stainless Steel of the current pro. I 100% hate glass backs though which is one reason I just decided to get the pro among other things. I can’t think of any other game changing case material off the top of my head for an ultra model.
Maybe a more rugged design like the ultra watch? It would appeal to some. Dual GPS and true Garmin like offline maps that sync to the watch would 100% get me. I’d be really surprised if they implemented that. I would love a rugged looking phone with some weight improvements. I don’t want a rugged phone that’s heavier than the pro, although I could get over with it, if they were able to mitigate the weight vs. new features like they did on the Ultra watch which I’m loving.
I think we are 3-5 years out at least from any kind of huge battery tech change that allows 25%-50% battery at the same weight.
A 7.2” screen? Something even larger than the pro max? Ya that might appeal to new and existing buyers. It would be a differentiator from Samsung and others. I certainly wouldn’t be a target, I wanted a 14 mini pro, so I settled for a 14 pro. The max phone are just too bulky for me. Ther are people that really want that all in one device though.
Cameras maybe, but I can’t personally think of many improvements. I don’t think most people really take advantage of all the camera stuff you can do now. True 360 camera scanning? That would be awesome, but I don’t think most people would ever use it and apple would have to develop software to go with it. Duel front cameras maybe since some other phones have it. To be honest I don’t know why that’s a thing or what you use it for though.
The 15, 15 max, 15 pro, 15 pro max will all have the typical yearly improvements probably. A little more battery life and a little faster. I feel like it’s been a while since they’ve had a massive jump. The 11 was a pretty good jump and then they have been just makes good solid years improvements. For the Ultra to sell it’s going to have to have something over the evolution in the regular 14/15 line. That’s why I can’t quite put my finger on.