"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Stores Experiencing 'Global' Issue With iPhone and Apple Watch Reservation Pickups
Some customers have reportedly been told to cancel their existing reservations and make walk-in purchases from available stock, while others are simply being told to wait things out while staff members discuss how to handle the situation.
We'll update this post if we hear more about the situation, but if you have an upcoming pickup window, you might want to be prepared for some delays.
Update: Apple's systems appear to be coming back online and reservation pickups are now being processed. There is, however, still a backlog of customers to work through.