Anybody else who wants to learn more about the source engine in video form?
Vote here!: http://help.gamedev.tv/forums/356757-content-suggestions/suggestions/18296398-source-game-engine
I’d imagine if anything was done with Source it would be a much more focused Dota2 Workshop course or something, even then you aren’t working with Source 2. Source 1 itself hasn’t been updated since 2013 and overall has not aged well at all, but more importantly it and its suite of companion software be done to death on training resources for over a decade now.
Source 2 has been completely up in the air since 2015 with not so much as a peep from Valve about it. We don’t even know if Source 2 will be released the same way Source 1 was. Unless Valve comes out swinging really hard, they won’t be able to compete with Unity, Unreal, and the scores of open and free engines available in today’s market.