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If memory serves me right, I don't think Homekit will be coming to Ring doorbell2. It's just the Pro that *may* get homekit support.
 
At this point I’m fairly certain the “HomeKit coming” in devices that didn’t ship with it is PR BS.

They don’t want consumers to overlook their products that are otherwise pretty good. Nor do they want to upset existing customers. The Apple customer base is too large an now they know we know HomeKit can be integrated via software authentication they are tippy toeing around the subject.

Canary security cameras have also been feed us the HomeKit line forever. And aside from improvements non HomeKit related I only really want HomeKit so I can use that for geofencing instead of relying on their app to geofence.
 
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