InterWorks Unlimited, maker of gaming accessories, have created a veritable "tin foil hat" for your Xbox One. The InterWorks Unlimited Xbox One Privacy Cover is pretty much a sliding piece of plastic you can put on your new Kinect in order to block its view when you're not using it. There is also the added benefit of protecting the lens, even if we're not exactly sure how we would go about damaging it with everyday use.
Perhaps it should be noted that you are in fact able to unplug your Kinect 2 from your Xbox One if you're worried that someone might be spying on you. Of course, sliding a piece of plastic may be more convenient and for $20 you could be doing that instead. Of course, your Kinect can still hear you...
If you're interested you can order yours at Amazon.com.