So he's writing a book on em economics? I'm actually a little disappointed - I was hoping for a grand synthesis of all the health care/Near-Far/signaling material on OB.
Em economics is a probably-irrelevant idea, since engineered machine intelligence is likely to continue beating it. It's one of Hanson's long shots.
Lecture at youtube.
Sorry - haven't watched it yet so no summary, but I expect it to be fun.