Prosser isn’t a leaker and neither is FPT. They’re both being fed false information and now so is Macrumors.
Apple’s current design isn’t a “squircle” — that would imply that part of it is derived from a circle, which the current, widely recognized and iconic iOS app icons design, is not. There are no circular parts to the iOS icon shape. The curves are Bézier curves, and resemble sections of elliptical ovals, not circles at all.That would be a sea change if Apple abandons the squircle. It's been part of Apple's design language since I can remember.