"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Apple Invites Media to October 16 Event: 'It's Been Way Too Long'
Apple is expected to introduce an updated iPad Air (and possibly a new iPad mini), as well as updated iMacs with at least the 27-inch model carrying a high-resolution Retina display. OS X Yosemite is also likely to see its final overview before public launch, and one rumor has suggested updated Mac minis are also in the works and could see an announcement at the event.