Though this agreement was outlined at the recent MineCon event, it wasn't until today that things changed within Minecraft. Now, after a quick visit to enable streaming in your account settings, you can stream gameplay footage at a moment's notice simply by pressing the F6 key. If any of that sounds too complicated, don't worry: the video above serves as a walkthrough of Minecraft's new streaming features.
The only caveat here is that Twitch support is currently only available to Minecraft players under Windows and OS X. We have contacted Twitch to ask if the game's Linux version might also see streaming options in the future and are currently awaiting a response.
Update: It looks like Linux streaming is not happening, at least not yet. Twitch replied to our inquiry, saying "Currently, Twitch for Minecraft only supports Windows (Vista and later) and Mac OS X (10.8, 10.9). Linux support is currently not planned due to licensing issues surrounding the encoding software."