"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Quanta to Produce New iMacs
A previous report from the same site claimed that the new transition would be a dramatic one.
Apple has been on a recent surge of product releases with recent iPod, iMac, PowerBook, eMac, and iBook releases in rapid succession. Presently, the LCDs and xServes hold the oldest positions in the Apple product line.