The Bot Which Walks 

Al Optimus is a walking robotic device similar to the Terminator, one need not be alarmed because this machine is not intended for activities like combat. In a promotion, Musk disguised Optimus as a girl with a gun and ready for action, but that was only to make it captivating, it's not a real weapon.

Too Cheap, Good Too

This is a moving computer that comes with high volume and a brain. Hearing its value will surprise you, but not if it is pricey rather than inexpensive. The starting price of Al Optimus is presumably worth less than $20k, probably based on the price of Bitcoin at the time of presentation.

What are you anticipating from Optimus?

     That is the question which has not yet received a comprehensive answer. There is no information other than the fact that Optimus is a humanoid. Something like Plateaued Boston Dynamics, or Asimo 2000. Omnibus is a re-run, we yet have to know how this project will go.

Thoughts 

 You may be wondering what would happen if someone tried to use it improperly or as a weapon. There is also no reason to be concerned about this. You can even break it with a stick for your own protection. It's currently not a weapon, at least.