Rollable phones. Don't know how foldable phones are seemingly winning that battle right now, because they seem to be ugly and impractical with a noticeable crease that makes an expensive phone seem like a cheap one.

The other big thing will be AI edge capability. There's a huge gap in performance between what phones need now for contemporary applications, and what they will need to run AI applications on the edge device. I really think this will be the driver in the need to keep upgrading to the latest phones, as even my middle tier device does everything I need.