For months I've been monitoring this closely and can provide a little more detail. Tesla submitted the Extended Warranty Contract and it was approved in June. I obtained a copy. However, I've been in direct contact with TM and they won't acknowledge that an Extended Warranty will be offered.
I can only speculate as to why. I've dealt extensively with the WA Insurance Commissioner's office and can say they act very effectively as consumer advocates (good folks). TM may be a little concerned by their sincere involvement.
For comparison, I reviewed the process TM went through in CA. In CA, Tesla received a rubber-stamp approval that appears to be merely documentation of the submission. As I recall, the "approval" took a day or two.
I carefully read the Extended Warranty that TM submitted to WA. In my opinion, it could expose TM to lawsuits. In summary, it covers absolutely nothing (and appears to be written by an idiot). It says TM will fix things when it's convenient for TM, and TM can change the terms at any time without notice. What kind of warranty is that?!
More speculation: I suspect TM is searching for a national auto warranty provider to execute and administer the warranty. Because some parts of the car are so expensive to repair, I think TM may be having trouble finding a carrier that will agree to the $4000 price.
In my opinion, the price should be $2500 for owners who purchased a car prior to June. The price was raised before we were given an opportunity to purchase the warranty. That's not what was promised/documented when I agreed to purchase the car.