According to ilounge and it's multiple sources, the 4th-gen iPod nano will look like the flash-based zune. Reading the comments on the actual article, you'll notice that there is no apple-bashing regarding the copied look of the new nano..go figure.
Contradicting speculation that Apple was planning to transform the new nano into a miniature iPod touch, complete with a smaller touchscreen, we’ve been told that this year’s nano upgrade will go in a different direction. Described by one source as looking like “a Zune Flash… or whatever it’s called,” the new nano has a vertically (tall) oriented display with a Click Wheel underneath, preserving the button-based control scheme that users have found easiest to use without looking down at the screen. 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.