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I also had not noticed the year on the date in the thread title, and had not seen this thread before. The result was that I started watching this video thinking it was recorded on October 8, 2015, wondering what announcement I had missed on October 9, 2015. When Musk started talking about "D and something else" I finally got it.
Elon appears to be well rested (finally), well spoken and articulated, and I truly enjoyed what he had to say (as always, of course). He truly is a special guy.