KUO REITERATES TOUCH ID IN THE IPHONE FOLD; UNLIKELY TO BE IN-DISPLAY

Summary from the TLDR Design newsletter

Apple's first foldable iPhone, expected in 2026 at around $2,000, will likely feature Touch ID on the side button instead of Face ID due to thickness and cost constraints. An under-display sensor is unlikely. The device will have a 5.5-inch outer screen, a 7.8-inch inner display, a minimal crease, and multiple cameras.