We’d need a suitably powerful APU upgrade in order to make running a 1080p screen viable. Most of the reason the Steam Deck performs as well as it does is because games are only rendering at 720p.
My wishlist for a Deck V2 would be a
Higher res screen (if it makes sense as I mentioned above)
Higher refresh with VRR (partially handled by thr OLED 90hz but no VRR)
Second USB-C port supporting USB4
Fingerprint reader
QoL improvements like smaller bezel, modern wireless chipset, etc.
AND a Steam Controller v2 as a companion with the exact same buttons/sticks/touchpads as the Deck.