A mockup made by me
You can see them in HQ:
White and
Black. By the way the + and - are Start and Select, not the volume things.
In my ideal 3DS, there'd be 3 processors: the 2 that games need (Arm7 and Arm9, I think) and one for the 3DS functions. That way, when you press Home, you could make the game enter "sleep mode" (as in when you close the DS lid) and have the third processor show a Home menu, similar to the one in the Wii. From here you could change the volume and the brightness, and play music (which could keep playing even while playing the game, since the game runs on the first two processors and the music on the third), and even use pictochat! You would also be able to use any odd functionality the 3DS brought, maybe a daily planner or a sketchbook. Also you can see in the mockup that there's two mics, this would allow the 3DS to detect where sounds come from so games wouldn't just ask you to blow, but they could ask you to blow in different directions to guide a paper plane, for example. I only put one camera because more cameras would make it too expensive, 3D screens and dual analog sticks (or should I say 3D sticks?) will make the price skyrocket enough