First is the shuffle. The last-gen iPod Shuffle was an interesting device. It had no buttons. It seems like it was more of an experiment than anything because it was only available for one generation before going to the current design (which looks much like the second-gen shuffle).
Below is the patent drawing:
The patent was filed in February 2010, so it's very likely that Apple was already working on the current model. Also worth noting is that unlike some of the dotted-line drawings we've seen in the past in which the dotted-lines represent parts that are not claimed by the design, this one consists of mostly solid lines.
Apple was also granted a patent for the iPod Nano, also the last-gen model.
Here, you may see that the dotted-lines make up the screen, the connector at the bottom and the headphone jack. Not much is said about the design, but this is nothing more than Apple protecting their properties.