Small is good... don't care if the shape is like 2nd or 3rd gen iPod nano or a 7th gen one... should have video playback but no camera, a clickwheel, bluetooth, FM radio option would be a plus, headphone jack would be nice so don't need to tote around some adapter to convert the connector to a shared port for simultaneous listening option via wired earbuds. Decent storage options for a nano... maybe 16GB min and max out at 64GB so even the high end is not that expensive.
Dear Apple: some of us are never going to buy either an Apple watch or an iPhone, or even an iPod touch, but a whole lot of us still have our 2nd or 3rd or 6th gen iPod nanos in a drawer somewhere, if not still working in a speakerdock in the kitchen! Meanwhile we can't stuff our rack systems into a pocket or handbag, but if we have a dumb cellphone (and even if we do have an iPhone but can't spare much storage space for music on it) we'd love to tote along an iPod with a good selection of music from our ripped CDs and all that music we bought off iTunes before streaming Apple music was even a thing.
Keeping the iPod going would be a fairly inexpensive way not to lose a base that is still out there looking for a next familiar thing that doesn't break a small gear budget. LOL keeping iPods in the mix would also make it way harder for Apple to drop the facility of syncing mobile devices to iTunes on a laptop or desktop if desired. Not everyone is always going to be able to rely on net access for either streaming or over-WiFi sync. When wired sync's not an option, maybe neither is Apple's ecosystem...