That's the strange thing - couldn't the 3G do this via it's BT anyway?
hell, screw the bluetooth - let's just have a nike+ app that uses the GPS and doesn't require a foot pod at all. Of course, nike wouldn't like that very much as it would completely cut their hardware out of the equation... but isn't there something a little ridiculous about having an iphone, which has GPS, rely on a wildly inaccurate external accessory to measure your run distance?