You are overestimating how difficult it would be, most look fine just from cropping the icon, that’s how the jailbreak tweak works. That said I would be surprised if Apple change to circle icons, probably won’t happen.
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Cropping works for app icons like the ones you’re showing there, but I’m talking about several app icons that use the full squircle space for their design, or use enough of it that you’d end up with weird parts getting cut off. For example, I’m thinking of the Wallet app, Duolingo, Files, Contacts, Journal, Screens, and Apple’s recent Sports and Invites apps. Some of those could have their symbols scaled down and inserted, but others like Sports use the icon to represent a real-world squarish space, a football field. Invites uses the square to represent an invitation envelope. There’s so many third party app icons as well that utilize the shape for their icons. So I think several would have to modify their icons to work with that system if that’s the new default and only way of displaying icons. 👍🏻
I’m glad we agree about the likelihood, I’m really hoping we keep the squircle icons, even if we see some new designs for the icons. What I’d love to see is something similar to the neumorphic icons on macOS. If they wanted to add an icon picker and an icon shape customization tool, I would be happy with that as well. 👍🏻
I am interested in seeing what other changes they would make with the UI. It would be interesting to see if macOS gains some more iOS and iPadOS touches, like App Library to replace Launchpad, the new customizable Control Center, Dark Mode icons, and maybe macOS and iPadOS will get some kind of Dynamic Island/Menu Bar hybrid. Also it would be great to get landscape Home Screen on iPhones again, FaceID now works in landscape, most games only work in landscape, and it can be awkward leaving a landscaped game to have everything else in portrait. With Apple’s focus on gaming on the iPhone, I think landscape mode interactions on the iPhone would make a lot of sense.
Split View would also be nice, especially on larger iPhone models. I personally probably wouldn’t use it, but I know a lot of people request it, and it makes sense to me as an option. 👍🏻