The response here is actually pretty interesting. While most of the comments seem to see a godly sieve that rumors fall out of when the planets align, I see the shrewdest company head that I can think of. His target market literally walked up to him and wanted to have a conversation, so he gave it to them. Sure, we all got some neat tidbits that we probably could have guessed (Source 2, less DRM), but Gabe is getting a chance to pick the brains of people who normally only communicate from anonymity. He can see what they fixate on in his own products and his competitors.
And, also super interesting, to me at least, is the specificity of his business related answers. He's wishy washy on upcoming content (probably because it's funny to keep people in the dark), but as far as what the future holds for his industry and company, his focus is laser sharp. There's no need for obfuscation because he's proven time and time again (as he says in the video) that no other companies really get what Valve is doing most of the time, and attempts to imitate them fail more often than not. I see a man with 100% certainty in his vision for Valve and its customers, and the billions of dollars that prove he knows what's up.
If Gabe Newell offered me a job cleaning toilets, I'd take it. Except that the janitors there probably also do sound mixing and database management.