From what I figure its a really professional setup they got there with 2 commentators and 2 players being rotated on the stream, I think you can only hear the commentators and the game sounds, also they are giving away razer gear. And guys stop being idiots there with the comments, that shit appears rolling over the screen like 'fap fap fap'
They take to much time between pulls and most of the time wipe in less then 30s.
ps. heres the stream link for those wondering
http://bogou.tv/v3/view/Keahoarl