This leaked bit of code has now vanished, but thanks to the quick work of @TheTeslaShow, we've got the info right here for you.
Tesla (well, mainly Elon Musk) seems to think this insurance offering will be a huge addition for the automaker, though others disagree, as the insurance business is indeed a tricky one to conquer. Regardless, it seems Tesla is pushing forward with this and now we have some concrete proof.
EXCLUSIVE: Discovered Tesla Insurance info on the Tesla website awaiting my Model 3 delivery.
Already in code:
Introducing Tesla Insurance. Select Tesla Insurance for low rates and one seamless experience.
Match your existing coverage or select a new plan with an instant quote.