I personally think that that feels like a huge mistake. They had such a short lifespan on the store shelves, and came in all of those great colors. What is Apple's thinking here?
… Perhaps the iPod Nano caters a bit more to the market of the iPod Shuffle with its slimmer form-factor, and it may also be cheaper to produce and less prone to breakage by using flash storage instead of a small hard disk drive (HDD) with moving parts in it.
Either way, it's a shame to see the iPod Mini go, especially with its classic and memorable design. 😢