As far as I can tell, this video is not from a larger organization. I sent OMGChad a tweet to verify that he was at PAX as an independent YouTube personality, but I didn't get a response. I couldn't recognize the intro bumper, and it didn't seem to be in use on any of his other videos, or any other PAX video that I could find, but it seemed like a significant amount of work for a one-off. If someone in the comments knows anything, be sure to leave a note.
Update, Sept 14th, 2015: OMGChad has just responded to my tweet. He was there "for myself and @MindcrackLP". Again, it's a minor point, but it's something that I should get correct if possible.
As for the story, OMGChad talks with Robin Walker, the man who takes responsibility for all the hats in TF2, about the Steam Controller in Alienware's booth at PAX Prime 2015. After several delays, the input device is scheduled to launch on November 10th (which will be a busy day apparently). It has changed significantly over time, with early prototypes even playing around with a touch screen. The two touch pads, while markers on them have changed from concentric rings to a cross on the left and nothing on the right, were relatively close to their original concept.
Robin Walker goes over the main design decisions and what rationale led to them. For instance, the reason for the grips on the back is because they found that people were taking their thumbs off of the view stick for just a couple of actions, such as reload or “use”. He also discusses the dual-stage triggers, which have a button at the end for secondary actions (like a nitro boost at the end of your throttle). It is somewhat expected that a representative for a company selling a controller would highlight what makes their product unique, but it's nice to have that extra behind-the-scenes insight.
The Steam Controller will launch on November 10th for $49.99 USD ($59.99 CDN). There was an option to pre-order to get it early, but the early batch is over so — let's be honest — you don't need me to tell you what you already did.