Sometimes I wonder if Microsoft really doesn't know what they are doing. How can they implement Twitch and praise how great and important it is but not have the possibility to stream your gameplay from Xbox to Twitch at release? That's like a joke... Not that I would need it but it's like "Hey guys, use Twitch on Xbox One to watch plenty of PS4 streams because we don't have this option"
Xbox One Will Not Support Live Streaming At Launch 
Microsoft announced new details about how Twitch will work on the Xbox One at launch. The good news is that you’ll be able to watch videos and earn achievements. The bad news is that you won’t be able to stream directly from your console for another couple of months at least.
“We know the ability to instantly broadcast gameplay is something the gaming community is excited about, and we are too,” Microsoft writes on the Xbox Wire site. “We are working to ensure the initial Twitch on Xbox One broadcasting experience meets the expectations of the Twitch community, so while this feature won’t be available right away, we’ll let you know as soon as it is ready. Our goal is to deliver it during the first part of 2014.”
The Twitch app will give Xbox Live Gold members access to everything on the service. The app can be snapped (placed on the right of the screen) and cycled via fast switching.
[Source: Xbox Wire]
https://www.gameinformer.com/b/news/archive/2013/11/19/xbox-one-will-not-support-live-streaming-at-launch.aspx