Twitch is one of the many entertainment apps coming to Xbox One. However, while you can already create your own in-game streams on PS4, the Xbox One app won't be able to do the same until early 2014.
"We know the ability to instantly broadcast gameplay is something the gaming community is excited about, and we are too. 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," Microsoft said in the announcement. "Our goal is to deliver it during the first part of 2014."
The Twitch app that launches with Xbox One will be able to play back streams. A short trailer for the Twitch app teases the new features, particularly the ability to use Xbox One's snap function to turn on a stream while you play. You can also bring it up with voice commands by saying, "Xbox, go to Twitch." Obviously, it will require an Xbox Live Gold subscription.
Finally, Xbox One viewers will be able to earn special "media achievements" simply by watching Twitch. The announcement cites examples like watching at night for a "Night Owl" achievement, or joining a stream with 100,000 viewers for the "Standing Room Only" achievement. It will launch with 10 Achievements, ranging from time spent watching in total, or consecutively, or during certain hours. Our favorite might be the "Hipster" achievement, for spending an hour watching channels that have less than 10 viewers.