Wibi!Data - New Portal 2 DLC, apparently?
I can tell you that this isn't DLC but a mod that TopHATTwaffle made for his client Wibi!Data.
I doubt Valve would make any more DLC when they have the community and the workshop.
That's what the video says.. but apparently you're right. This was contracted by the company "Wibi Data". What strange marketing... I didn't even know they existed before this (which I guess makes it a successful marketing campaign)...
It's not VAVLe official, just a project the company had me make. 
http://www.tophattwaffle.com/ - My site for Source Engine Level Design
http://therewillbescience.com/ - Portal 2, Lab Rat
http://www.moddb.com/mods/portal-2-lab-rat - Portal 2, Lab Rat (MODDB)
I know, I think that's what I said, but the installation is in the dlc directory.
This is only because of the priority in the path that the game uses to load stuff set up by Valve since the first DLC: they made the game loads first the higher no. after DLC, then the inmediate lower number, and so on (for example, it'll load the content into Portal2_DLC3 firstly, then DLC2 then DLC1). Also there's a paralell priority into each DLC folder: the pak01_dir.vpk content overrides whatever content into the DLC folders (i.e. whatever portalgun skin into the materials folder inside the .vpk packed file into Portal2_DLC3 folder will prevail over whatever portalgun skin you place outside into the Portal2_DLC3/materials folder, understand? )
This is only a quick and easy way to have a Portal2 "mod" with a lot of custom stuff well organized and working like a charm... BUT as soon as Valve releases the real DLC3, it will erase this DLC3 folder we are creating now 
We'll only have to be careful and rename this "fake" DLC3 to DLC4 for example before that happens 
useful tools and stuff here on TWP 
[spoiler]
[/spoiler]
Yeah, like all of us
useful tools and stuff here on TWP [spoiler]
[/spoiler]