Dual Screens with almost no bezel inbetween
Rumble or Haptic Feedback (through the stylus)
Tilt/Motion Control
3D Screen (x2?)
Touch Screen (x2?)
Multi-Touch(?)
Hi-Rez screens (854x480)
More Online Focus (3G enabled?)
3D Camera (x2? inside and out?)
SD card slot (64GB+)
Dual Media DS Card Slot (DS & 3DS Holographic)
GC<-->Wii Powered (closer to 360?)
DSWare (& AppStore?)
Full backwards compatibility with DS/i (not GBA)
Onboard flash (4GB+? please)
Virtual Handheld (this has to become a reality)
Netflix 3D support DAY 1 (a personal hope of mine... it's my list, I can add it if I want to)
Analog Stick
Holographic Storage/Encryption
Holiday 2010 Launch
<$200 price point (It's gotta be less that $229 for sure)
Animal Crossing 3DS @ Launch (GUI or system interface? pre-installed?)
10+ hour Battery life when in full use of all features.
Did I forget anything?
I realize it's a quickly-made rough sketch, but you're forgetting the hinge. And with that 'seamless' screen, the inside edges will be completely exposed when folded up.
I thought about that, but like you said, it's only a quick sketch. The seamless bezel might be achieved with a slightly raised top edge on the bottom screen that would line up with the bottom of the top screen when the unit was open while also hiding the hinge.
I can picture it in my head, so if Nintendo wanted to make it happen, I'm sure they could find an even better way to make it happen. You know, billion $$$ designs and all.