My, how times have changed.

Musk's Texas company now is floating ambitious plans to deploy thousands of humanoid robots, known as Tesla Bot or Optimus, within its factories, expanding eventually to millions around the world, according to job postings. Buzz is building within the company as Tesla is having more internal meetings on robots, a person familiar with the matter said.

Longer term, Musk said at a TED Talk robots could be used in homes, making dinner, mowing the lawn and caring for the elderly people, and even becoming a "buddy" or a "catgirl" sex partner.

The robot business eventually may be worth more than Tesla's car revenue, according to Musk, who is now touting a vision for the company that goes well beyond making self-driving electric vehicles.