It would be interesting to hear him speak about the pros and cons of different body plans. Are three or six legged robots useful, compared to four legged ones? What about multi-armed humanoid robots?
Someone asked that question and he kinda punted on the answer. He said humanoid robots are theoretically useful for operating in spaces designed for humans, and also get orders of magnitude better responses from the public, but spreading out the motors and balancing tech in a quadruped gives much more space to work in.
See: T=46min