The above capture is from a viral video making its way around the internet. The video is title What's in the Box, and appears to be part of a viral campaign from Valve. Why? There's a lot of similarities with the style of the shots and look of the video with that of their games, especially ones in the Half-Life universe. In fact, many of the sound effects used in the video are directly from Half-Life 2.
There's really not much else out there, and frankly, we have no idea if it's game related or even if there's co-op. But the video is so damn cool we figured we just had to share!
Update: Turns out it's just a fan video. Thanks Bakken Hood
Found via Psykoboy2's Twitter