Hmm, about that "3DS":
1: It'll still stay below $200,- . Price has always been a very important point, that makes or breaks consoles, and ninty knows it...
2: In order to properly be able to do "real" 3D, the GPU will need to be cranked up severely. The DS's 3d-engine is a bit on the weak side... =>current smartphone-performance would be nice, and should be achievable (but that's going to make the handheld more/almost as powerful than the console...)
3: That 3D-screen (I expect only the top-screen to be 3D, might not play nice with a touch-screen) is going to be relatively expensive. And it'll have to be good, or it's going to be smashed down hard.
4: I won't be surprised if they'll just dump in every single frikkin peace of hardware they can think of that might be of use to games (for starters, motion-contoller, bluetooth, motion-tracking cam, hi-res screens, wiimote-extension-connection), without getting the price above $200,-
If they can manage that, (below $200), they'll have one heck of a big winner. And we'll actually have competition...