"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
New iPod Peripherals? [Updated]
Reliable reports now indicate that Apple is poised to launch two new peripherals (not accessories) specifically for the 3rd Generation iPod owners. Unfortunately, details of the items are unavailable at this time.
Update: Appleinsider provides some independent confirmation of iPod peripherals coming. One "suggestion" is an input dictation device, but this information appears to be speculative.
The only additional information MacRumors can provide at this time is that the upcoming peripherals will require an iPod software update to utilize the new hardware.