Twitch announced Group Chat Beta this morning via Twitter. Group Chat is a way to create invite-only chat rooms that live separately from the traditional Channel Chat.
You can take a look at the official tweet below:
Group Chat Beta rolls out gradually starting today. Hang in there for your chance to create or be invited.
— Twitch (@Twitch) April 3, 2014
For more information, check out the Twitch Group Chat FAQ website. Let us know if you get an invite to the Group Chat Beta.