"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Apple Store: Physical Gift Certificates and Pre-Installed Software
First, as noted on MacMinute, Apple now offers iTunes Gift Certificates that may be physically mailed to the recipients. The presence of iTunes Gift Certificates for sale at the Apple store has been previously reported but were only available in electronic (email) form at that time.
Physical iTunes Gift Certificates are also expected to be available for sale at Apple's November 28th Apple Store Music event.
Second, Apple's Online Store now also offers a new Build to Order option -- allowing users to purchase and preinstall some Apple Software packages such as Final Cut Express and Keynote on their build-to-order machines.