"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
iPod and WMA Functionality
Certainly, Apple's decision not to allow the iPod to play WMA-formatted songs has always been strategic one rather than a technical hurdle.
With HP's recent adoption of the iPod, there was some speculation that the iPod would support the Windows format, but HP clearly stated that WMA support was not planned. As well, reliable sources had indicated the same.