HardwareLarger 3D screen on the top OR touch screen the same size as the current 3D screen on top.
Also atleast 8GB of internal Flash memory and a minimum of 256MB of RAM to help out applications other than games too.
Concave the top lid so that it has a lip that closes flush with the bottom when closed like the current DS
3D camera on the inside too.
Bluetooth & USBmini (for managing internal and SD card memory)
Release in those beautiful pearl based colors you showed at E3
SoftwareBackground OS that's games and software run within.
Multi-tasking, like background downloading and idle updates
Account log-in w/ friends list - NO GAME BY GAME FRIEND CODES
Downloads attached to account - not system
system attached to account - gotta log in to use online (prevents theft)
I'm with Rachtman. I think back to the glory that is the GameCube controller and I miss that kind of form fitting design. We're stuck in a nightmare of rectangles with Nintendo's designs and I wouldn't mind them taking a shot at making a more ergonomic 3DS.
However, most will call anything but sleek rectangles "ugly and dated" so they can't really win.
It's gotta be appealing and not look like a toy. It's also gotta fit in your pocket or purse.
You want people to want to take this out in public with them and not be embarrassed to pull it out and use it.