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
I hope that with the Deck 2, which is still 2 years away probably we get a larger battery, a better APU likely based on RDNA3+ or better at that point depending how technology shifts and the OLED panel that the current one has, maybe with a slightly higher refresh rate of 120/144.
Hopefully they find a way around membrane switches underneath all the buttons, as I’ve never been a huge fan of membrane and there’s gotta be better options out there, not saying the buttons are bad I just hope we’re getting something more reliable than membrane as in my experience that stuff usually gives up quick.