"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
2nd Generation iPod Touch Does Work With Microphone
We had previously reported that Apple's new microphone headsets were listed to be compatible with the 2nd Generation iPod Touch, although we had initially expressed some skepticism as this feature was not listed in any other location.
Allowing users to conveniently add an external microphone to the iPod touch opens up the possibility of using the iPod Touch as a telephone over Wi-Fi connections (VOIP).