For users part of the Xbox Insider Program, you should have access to the new Beam app on the Xbox One. Microsoft acquired Beam last summer in August. It was originally a competitor to Twitch and no details of the acquisition were ever published. But now Microsoft is putting it to good use and baking Beam into the Xbox One and hopeful into Windows 10 in the future.
It allows users to broadcast gameplay live to the service, practically identical to Twitch and also allows the gamers to interact with the audience with a chat system. Beam will be available publicly in the spring but early adopters can gain access now.
Source: The Verge