The video is uploaded now: https://www.youtube.com/watch?v=gEtHu3AXw2Q
David Braben answers for the first hour of the video.
On a related note, Ed read my question (YAY!), but I didn't write clearly enough and neither of them understood it (I'M NOT WORTHY!).
(I had tried to ask why the new terrain system introduced in 2.0 wasn't implemented on rocky, metal, or ice worlds if they have atmosphere) I'll try again for 2.2 I guess.