Various readers and sites have been noticing that one of the findings of the preliminary iPhone 1.1.1 Jailbreak was that Apple was referencing com.apple.mobile.radio and com.apple.mobile.nike.
The most obvious implication of this is that Apple appears to be preparing for Nike+ support for the iPhone and/or iPod Touch. Apple's reference of mobile.radio may also indicate that the iPod Radio Remote accessory is being made compatible with iPhone/iPod Touch.
Currently, Nike+ products only work with various generations of the iPod Nano. The iPod Radio Remote works with the iPod Nano and 5G iPod and later.