"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
First iPhone 5 Unboxing Photos Reveal Packaging Layout and EarPods Travel Case
The EarPods appear to be packaged identically to the standalone retail version of the new Apple earphones, including a small travel case.
iPhone 5 (left) next to iPhone 4S (right)
The first round of pre-orders are already en route to their destinations, although Apple has arranged for carriers to hold deliveries until the official Friday launch. It is not unheard of, however, for a handful of deliveries to slip through early.