At their E3 Conference, Nintendo has revealed the 3DS:

3DS is the final name.
Uses a clamshell design like the original DS.
3D on top screen, touchscreen on bottom.
Includes an analog nub.
Full BC with the Nintendo DS and DSi

Breakdown:

Two front cameras? So it's technically the first gaming system with depth perception.

I'm curious what the "3D depth slider" does, exactly. Makes it so that it uses less of the depth perception and more just the plain 3D graphics we've had for years, I assume.

New Paper Mario! Yay!

RIIIIIIIIDGE.... RACERRRRRRRR!
Not that interested. Just wanted to say that.
I remember back when Ridge Racer was a key title to a non-Nintendo console's release.