What do you want from the next Nintendo Handheld?

[MikeRox]

To have roughly the power of the Wii U (so a bit more than Vita) looking at mobile hardware now in a year or two it should be feasible to do for a reasonable price.

Also as others said:

Decent resolution screen
Dual analogue
Account not tied to single system
Pretty much all the things Sony got right with Vita and a shared Virtal co.sole (for cross buy of retro and eshop titles when on more than 1 system)
MMO Pokemon