It IS a Valve video, and it's new. Descriptions of the video and audio were leaked a while back, but this is the first time the full video has been released. A search on TW would have shown that there's already a "Meet the Scout" thread that was started today.
The above posters as pricks for being such assholes about it, but a simple search for the word "scout" would have revealed the other thread that was posted about 2 hours before this one.