"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
SIM-Free iPhone X Now Available From Apple Online Store in the United States
SIM-free versions of the iPhone X in all capacities list the same ~one week delivery estimate available for other iPhone X devices. SIM-free iPhone X models ordered today will arrive on December 12.
SIM-free iPhone X models will work with any carrier and have full support for both CDMA and GSM networks, much like the Sprint and Verizon versions of the new smartphone. iPhone X models from AT&T and T-Mobile do not support CDMA networks and are not compatible with Sprint or Verizon.
Since iPhone X pre-orders kicked off on October 27, Apple has only allowed customers to buy an iPhone X with an AT&T, Sprint, T-Mobile, or Verizon SIM, though models purchased in full are listed as unlocked. At launch, Apple was requiring carrier pre-activation to make an iPhone X purchase, but that requirement was lifted in mid-November.
It's been possible to get the equivalent of a SIM-free unlocked iPhone X ordering a Verizon model and paying full price, but now there is an official SIM-free version.
Now that SIM-free iPhone X models are available, Apple is will also soon allow its employees to purchase the iPhone X through the internal employee site at a discount.