Still no update about the HomeKit integration, Dkorda. We greatly appreciate the anticipation but we are still in conversation with Apple and no specifics have been finalized yet. Please stay tuned.
This really needs to happen. I've just started to invest in WEMO with the assumption that it would eventually integrate with my Apple TV via Siri. I will be extremely unhappy if this doesn't happen soon. I find it hard to believe that Apple would stand in the way of anything that encourages people to buy an Apple TV.
I have Homebridge setup on a Mac Mini ... took all of 10 minutes to get everything installed and configured. Then using the Home app (in iOS) I am now controlling my WeMo devices (3 switches, 3 outlets) and have created Zones, Scenes, and Triggers using two NetCam HD+ cams for motion detection along with the usual triggers (time, chracteristics, etc.) And I can control all the devices and scenes with Siri or right from Notification Center in iOS. And with an AppleTV gen 4 in the house ... this works off my network. It really works very well and would recommend giving it a shot.
The AppleTV itself does not issue commands to HomeKit environments (yet, anyway). But, as long as the AppleTV and the iOS device are signed into the same iCloud account, the AppleTV can act as an out-of-network relay of sorts. You still have to interface with your app or Siri in iOS, but AppleTV acts as the bridge when you are no longer on your wifi network.