Apple may be preparing a bit of a refresh for its iPod lineup, possibly adding brand new colors to multiple devices. When setting up or restoring an iPod in the recently-released iTunes 12.2, the following image is displayed at the beginning of the process:
Currently, Apple does not offer any of these colors on the iPod touch, iPod nano, or iPod shuffle. Note also that the iPod touch in the image is missing its button in the lower corner, which currently pops out to attach the camera strap.
While this could be that there was an error when creating this image for iTunes 12.2, it has been a while since Apple refreshed the iPod line, and they might think that it's due for some change. If the image is indeed showing off new products, then they could even see the light of day fairly soon.