The iWatch is going to be a bigger part of this than any of Apple's other devices. It's a much more intuitive way to control these things. The point is you should be able to make commands at any place at any time in your home. You don't need to reach to/find your phone. Just speak into your watch.
i don't know how i didn't put these two together.. this just completely 180'd my opinion of the iwatch's possible success. i still wouldn't really want or need one in my small urban apartment, but this is a huge - gigantic - stab at changing things.