Yes. All prevoius Yeelight products with WiFi functionality is capable of Homekit support. Yeelight might include a setting in the Yeelight app to enable Homekit and show the device’s homekit code in a future update.
I have now received my V2 yeelights and can confirm that they are NOT HomeKit supported and there is no mention of HomeKit on the packaging. Not that I expected anything else, just letting people know so they don’t get misled from Banggood, Gearbest et al.