Controlling lights using Siri on my iWatch will be kind of cool in a knightriderish way.
A light switch in an iWatch sounds good until you realize that everyone living in the house would then need an iWatch and need to have it on 24/7. House guests would need a loaned iWatch too.
A better solution would be to mount a microphone to a wall some place. Then anyone in the room could use it without needing their own $600 watch.
No one except true geeks will want anything like this until the technology is standardized and available at Home Depo as commodity parts
The place to put the WiFi is in the wall switch, not the light bulb. But it's marketing saying that few end-users know how to change out a wall switch but most can install their own light bulb