Nah, you don't have to hack your iPod. All you need is the Motorola Music Duo. Simply connect the included naviPlay bluetooth adapter to your iPod (iPod, iPod mini or iPod nano) and wirelessly stream music from the iPod to the Motorola Bluetooth stereo headphones, which is also bundled.
And while the headphones are wirelessly getting music from the iPod, they can also be connected to your compatible bluetooth phone simulatenously. When a call comes in the music will mute and will resume automatically when you are finished talking.
Works for upto 10 straight before the charge runs out and would be available by the end of this quarter.