"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
4th Generation iPad Launch Day Pre-Orders Sold Out, First iPad and iPad Mini Pre-Orders En Route
Wi-Fi fourth-generation iPad models with one-week shipping estimates
iPad mini pre-orders are continuing to hold at two-week shipping estimates, while those who were able to get their launch-day orders in are monitoring delivery progress. Those who ordered iPad mini Smart Covers have been seeing their accessories delivered yesterday and today, while MacRumors forum members have been following progress of the devices themselves in an extensive thread.
While Apple's official online order status pages generally still show iPad mini pre-orders as "Preparing for Shipment", most of the orders are actually already en route. Some users have had success locating their packages by searching FedEx tracking using their phone numbers as references, while others have had success by looking up the serial numbers of their devices and using those as references to track via UPS.
iPad mini pre-order en route via UPS for Friday delivery
Cellular-capable models of the iPad mini and fourth-generation iPad will not ship until later this month, with the earliest pre-order customers seeing estimated delivery dates beginning November 21 in the United States.