Sadly, it is only for closed beta players, and Valve is not likely to allow it to be streamed on Twitch.
I don't really understand why Valve isn't letting us watch the stream. The beta is about to start anytime soon, and many of the cards and game mechanics are already revealed through Twitter. Why say that they're going to be having a tournament in the first place? They could have just gone with it secretly without triggering our curiosity.😡
Cartman sobs, Cartman replies. Thank you😂