Actually the outer metal conductor is supposed to be what sends volume signal information to the ipod.
So, since the iphone is missing the contact on its end for this it's unlikely apple will get it working in FW.
That does not make sense. Here are the pin-outs for the iPhone standard (no volume control) ear phones:
Tip (1) - Right
Ring (2) - Left
Ring (3) - Ground
Sleeve (4) - Microphone
Clicking the button shorts Microphone to Ground.
Since the new Apple In-Ear Headphones work in the iPhone and support the same functions, the pin-outs must be the same. There are no extra contacts on the Apple In-Ear Headphone connector and no missing connectors on the iPhone since it must support all four.
It's quite possible that the iPhone does not have the hardware to deal with reading whatever signal changes occur when pressing the volume up and down buttons on the Apple In-Ear Headphones. But, the iPhone connector has all the appropriate physical contacts to support the volume feature.
S-