"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
OS 9 Classic Only
According to staff at the UK Apple Store Apple will not include a Mac OS 9.2 install CD with Mac OS X 10.2. Of more significance, neither will an OS 9.2 disc be included with new Macs. Instead, Classic will reside on a Restore CD.
There are scattered reports of people receiving their new machines, but no confirmation on OS 9 Install CDs exclusion.
Persistent rumors have indicated that future machines will be unable to boot OS 9.