Apple patent applications either meet with resounding "I want that, give that to me now!" or "meh, why?" and it seems the reception to these iPod Bluetooth Headset illustrations is leaning toward the latter. The patent application shows a device similar in shape to the existing Apple Bluetooth headset, but that would have a detachable second earbud, an integrated display and onboard storage.
That storage would turn the headset into a full-blown iPod, similar to the shuffle. You would also be able to record voice notes, since it would have an integrated microphone, and of course it could be used for hands-free calling in the regular way. Apple's application also describe a form of basic automatic volume adjustment that would change earpiece volume depending on the ambient noise picked up by the microphone.