"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
iPhone 6 Reportedly Launching 'As Early As September' in 4.7- and 5.5-Inch Sizes
Manufacturers have apparently begun making such components as fingerprint sensors and chips for liquid-crystal drivers.
Mass production of LCD panels will start as early as the April-June quarter at Sharp's Kameyama factory, Japan Display's Mobara plant, and at other facilities, according to sources. LG Electronics will supply panels as well. The new handset's display resolution is expected to be significantly higher than that of current models.
Earlier this week, UBS analyst Steve Milunovich claimed that the 4.7-inch version might be the only model to launch later this year, with a timeframe for the larger 5.5-inch version unclear.