Kotaku has a pretty detailed article up showing off a mock up they compiled using everything we know so far about the 3DS. I gotta say, of all the images out there this seems pretty believable. I would love if there is a nice widescreen like that and it appears that according to a leaked circuit board image that it may have an analog stick. Not a nub, mind you, but a full on stick, which is one of my major gripes with the PSP. It's a pretty neat article that I think is worth taking a look at if your interested at all in Nintendo's next gen handheld.
Source:
Kotaku