"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Mac Notebook and iPod Updates in September?
Based on past experiences and knowledge of their own inventory sell-through, those resellers who received the bulletin believe the notice is a strong indicator that Apple will begin introducing its holiday consumer electronics and Mac offerings sometime in early to mid-September.Apple has refreshed their iPod lineup in September for the past 2 years and is widely expected to do the same again this year. Apple's free iPod Touch Back to School promotion coincidentally ends on September 15th.
Rumored possibilities include a new iPod touch, "tall" iPod nano, MacBook with glass trackpad, newly designed MacBook Pros, and, of course, a Mac tablet.