Last night, after a wait of roughly an hour after the official start time, Elon Musk spoke to a crowd of Tesla fans and some journalists on a film studio backlot in California to give us an update on the company's much-talked-about pivot to robotics. In an act redolent with symbolism, Musk emerged from a facade built to resemble an actual building, then stepped into an aerodynamically styled two-seater that combined the shape of a Honda CR-Z coupe with the doors from a McLaren supercar.