The new nano’s screen will gain the same 1.5:1 widescreen aspect ratio as the iPhone and iPod touch, versus the 1.33:1 ratio of the prior iPod nano and iPod classic, and you’ll rotate the device to watch videos on it.
To fit the screen and Click Wheel neatly together, the new nano will adopt a form factor that shifts away from the almost square dimensions of the 2007 third-generation nano back towards the general shape of the first- and second-generation models.
iLounge sources also noted that rumors of a multi-colored body are most likely inaccurate. A single-colored anodized aluminum frame similar to previous iPod nanos will apparently be used.
iLounge sources are extremely confident in the accuracy of these details.
(This is a mockup. Not a real product!)