For me I would like the following
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More power with the same battery life
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Same 800p OLED Screen, but supports 120hz VRR
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Vita D Pad and switch placement with left trackpad (They can sell 2 models for classic set up)
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Official Dual Boot support with Windows specific Software for the same TDP Control etc and more driver support
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2 USB C ports
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More Color options (White, Gray, Black, Orange, Translucent)
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NVME 2280 support
SIM card slot so I can grab a cheap data plan and always have “access” even when offline mode is fuggy.
External GPU support.
Wireless charging with the option for a case with a build in powerbank.
But overall these would be nice extras. I’ll be happy with even longer battery life and performance.