Here we can see a concept (with some working demos) of  Home Automation via voice command on the Lumia 920.

HomePair: Voice-Command Home Electronic Appliances Control via Bluetooth and NFC on Lumia 920

When technology meets imagination. Lumia 920 has been transformed to Voice-Command Home Electronic Appliances Controller via Bluetooth and NFC. This video demonstration show you how this project work. Please note that every single part of this video are not just the concept but it works for real. Check my previous videos about “NeuRoom” if you don’t believe it.
 
Thanks Peter for the tip!