I'm a bit skeptical that that analog stick would be confortable, not doubting you or anything, maybe it has to do with hand sizes, it just seems like my thumb would have to "flex" a bit too much.

How would the hinge work? In order to have the screens that close to each other, a very unique hinge would be necessary in order to keep them close while at the same time allowing it to close and not grind against each other.

I'd also like to say that stuff like this and what richardhutnik said is what I was looking for with this thread. A general sharing of ideas and opinions is what I primarily wanted. Actually designing something is just where I hoped it would lead. ^_^

I dont think 2 analogs stick are need on a console with a touch screen , for example , Metroid prime hunters on the DS had really solid control skin i think that the problem with that game was the lack of One analog stick to move samus in a more smooth  way ,but two analogs stick in a portable system is too much ...

I if is possible to put both that close in a way that they dont touch each other , i think you pretty much nailed the concept in my head , but i gotta say i really like the idea of one huge rotating screen , but we should also take in consider how durable would the spinning screen system be cuz you see there is alot of room form it get broken or stuck at some point , with the player constant changing it.

I have a made a mock-up sketch on paper some days ago, now I have it on desktop in jpeg but I don't know how to post it here, could someone help this noob out?

It's Ok I understood it has be done.

Here it is, as you can see it's very similar to the original DSlite (I kept the same external sizes) but there are some differences

The 2 screens are now 3.5 inches (both touch screens naturally), and there is now only 6mm wide gap between them. The camera is on the top of the upper screen, there are now 2 direction microphones, below the speakers.

As you can see there is an analog stick on the left side, the old d-pad in now on the right-bottom corner, where it can be useful for camera controls in 3D open games, and also of coure as addition buttons when is needed. I want to be able to use the d-pad along with the analog stick, not just as a replacement, that's why is the right corner and not in the left. Also using this formation it would be possible to play all N64 games on VC, using the d-pad as the c-buttons replacement.

I also considerd of moving the d-pad on the top-right corner of the upper screen, to be used holding the console vertically (as a book), but in the end I prefer the other solution

The origilal DS resolution is 256x192 on a 3inches screen, this means a resolution rate of 40pixels/cm. Some developer has stated that this 3ds will have about the same power as a Gamecube wich runs at about a 640x480 resolution, this means that it has to render  307200pixels. Keeping this in mind I would say that the 3ds resolution will be about 441x336 resolution, this on 3.5inches would mean a 60pixels/cm and a total of 296352 pixels to render (considering 2 screens) a similar amount to Gamecube's. (that's naturally just speculation).

I like the one big screen idea a lot.

Someone think that the 3DS could has two cameras on the same side for 3D augmented reality? like the rotating ones from the fake prototype.

I would say not, for two reasons.

One, because that would be a "copy" off of Microsoft and Natal, and we all know Nintendo hates to imitate.

Two, because they can effectively pull off the same thing with a single camera anyways, especially since there are supposed to be accelerometers in the 3DS, effectively assisting the cameras in motion sensing.

D-Pad below ABXY...

Get the hell out of here.

Yah, it seems like that would break backwards compatability. True, they could map the analog stick to work like a d-pad when running DS(i) games, but it wouldn't work as well. Mabye they'll do an N64 d-pad position (it's better than playstation claw).