I would like to confirm where exactly did you see the USB with the NUC? Can you please provide a link so I can check the information?
From our side, we have no information about this but I will check this out.
I believe the USB dongle was meant to show the size of the NUC for comparison. I remember thinking the same thing when I saw the picture...what's on the USB dongle? Drivers? An OS? Then I realized they were trying to give some perspective on just how small the NUC is.
If they'd just put a picture of the NUC by itself it would be hard to tell.