"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Destra and AAC?
Of interest, the article states that the songs will be available in both WMA and AAC formats. It goes on to specifically state that it will be compatible with the iPod.
Reportedly there will be "protection from copyright violation" built in. It isn't clear if the service would be offering the same FairPlay/AAC ("Protected AAC") files that are presently offered in Apple's iTunes Music Store.