I just received my new philips hue hub today. My Wife and I can now lift our wrists up (Apple Watch) and say "Siri, Turn off all the lights" anywhere in the world (as long as we have internet) and they go off :-)

Dim the Lights
Turn off the lights in the Lounge
Goodnight (Turn off all the lights in the house)
Turn on all the lights upstairs
etc

Are now all possible from my Phone or Watch.

Now to find some power adapters (240V NZ Pin-out). (I have ZWave ones already and Controller (http://razberry.z-wave.me/index.php?id=9) or find someway or getting homekit to talk to other devices.