I seem to recall that the case makers do not get detailed info about upcoming devices, much less names. They seem to get very simple drawing that only indicate the dimensions and I/O points on the device. Only after the reveal are more comprehensive plans made available.
As for the nomenclature, I think its mostly irrelevant. I think the more important question is why we think Apple would kill the current Nano styling?
Note that Apple has been building this device for 7 generations now. Five generations of the Nano, which replaced 2 generations of the iPod Mini which used a 1 HDD over NAND. So what reasoning do you have to think Apple will, for the first time since building iPods continue a product line by removing features? Why would a device that was capable of being held in the hand for video recording now be replaced with one that either has no such ability or would seem to be less comfortable to hold if a video camera was included?
What really bugs me is the display size. Why not go with a larger display that is equal to or greater than the current Nanos display. In widescreen a square display will make video unwatchable. You could also pack more features into the larger footprint. Apple likes to go smaller, but they typically do so if they maintain or increase the feature set in the process.
Its for this reason I think (regardless of what this is called) that the current Nano design will not likely be killed tomorrow as it fits a niche that is not covered by this rumour, the Shuffle, the Touch or Classic.
Also, even with the Classic so long in the tooth its still part of their lineup even when they kept adding new iPods. Why must one die so the other can live?