The Canon EOS C100 Digital Video Camera is now available for purchase with a Dual-Pixel CMOS AF Feature Upgrade. The revolutionary Dual-Pixel CMOS AF technology, originally introduced on the Canon EOS 70D, will enable continuous autofocusing with Canon’s entire EF lens lineup. Additionally, the EOS C100 now has three new EF lens kit bundles to complement the Dual-Pixel CMOS AF technology.
I expect the C300 to follow a similar pattern. There's no reason for Canon to not just sell these cameras with the upgrade right from the start. For existing users they're required to send their cameras in to Canon to receive the upgrade, but for all new users just joining the family they shouldn't have to. This just makes sense.