Secret 4G iPod Features?

This week's Time Gadget of the Week is the 4th Generation iPod that was recently introduced by Apple.

It describes the new features including battery life improvements and the new click wheel... but offers a surprising hint at more to come:

But you should know that internally the new iPod is a ground-up reconstruction, and its really compelling applications the ones that very well might get the goat of anyone unable or unwilling to upgrade are still secret. All that Apple is saying is that there's more to this than what's being publicized.