An addition of
triggers to the shoulder buttons a la Nintendo's Switch (and the Vita
trigger grip
accessory), microSD cards (non proprietary memory), direct connection to TV's (whether HDMI, Screen Cast, both or
by other means), clickable analog sticks, better connectivity with the PS4, and future proofing for any other PlayStation console that might surface in a few years, could make the new handheld a force to be reckoned with.
A while ago we talked about a clever
accessory for the PS Vita 2000 about to be released in Japan
by Joetsu Electronic Industries, adding two convenient L2 and R2
triggers to Sony's portable for better PS4 remote play performance.