"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple to Begin Offering Unlocked, SIM-Free iPhone 6 and 6 Plus Models in the U.S. Tomorrow
Pricing will remain the same alongside the other unsubsidized iPhone 6 and iPhone 6 Plus models, with 16/64/128 GB versions of the iPhone 6 selling for $649/$749/$849 respectively, while the 16/64/128GB versions of the iPhone 6 Plus will be available for $749/$849/$949.
Notably, many of the carrier-specific iPhone 6 models sold by Apple have been unlocked since launch when purchased at full retail price, although the company has not been specifically marketing them as such. As with other unlocked devices, the unlocked versions of the iPhone 6 and 6 Plus will allow users to insert a nano-SIM card from a compatible GSM network for cellular voice, texting, and data connectivity. Apple launched unlocked versions of the iPhone 5s last year in November, which followed the release of carrier-specific models in September.