Mark Gurman has talked to people who have used the new foldable iPhone:

People who have tried the Apple model like how it fits in a pocket, the feel and durability of the advanced hinge mechanism, and the new iPad-like app layouts that take advantage of the larger internal display. It’s going to be an ultra-premium device that provides a halo for the full Apple lineup and will be a marketing engine to get people into the company’s retail stores.

At $2k, it’s just too premium for me. I still think what I’d really want is a foldable iPad mini with no outer screen.