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It's a weird kind of segmentation. We have tablets for when phones are too small and laptops are too big. Now we'll have folding tablets for when phones are too small and unfoldable tablets are too big.
I'm interested for very specific reasons.
Lots of my day work is server admin, although its possible to run the app Teamviewer on a regular iphone -- and it works pretty well -- there are some usecases where it sucks.
You have to "scroll" to different areas of the screen in Teamviewer if using on a small phone. It would be nice to have 2-in-1. A small phone for 90% of my day, and if/when I need the real estate for Teamviewer to have that available.