It looks to me like TM is doing a market assessment of the charger situation, probably centered on this forum. The easter egg approach is the most unusual part of this and presents the possibility that early purchasers who are not part of this forum or who do not conduct thorough research could end up with a production X that could have been made "better" in the mind of a range-anxious consumer. Remember that CA consumer fraud laws apply to manufacturers who treat consumers "unfairly", and that a jury is given the task of defining unfair. But given that no MX's have been delivered (it's clear the car is still under development) it's easy to fix that before production with a simple phone call or e-mail to fully inform the purchaser once the final design chargers decisions and options are in place. I know the hope is for a fully fleshed-out SC network, but the entrenched interests have their backs up and are not going to make it easy. This is why SC alternatives, which require robust on board chargers, are really essential. The Tesla community is informed and creative and as I dip my toe in the EV world I greatly appreciate all your thoughtful insights.
Your definition of "under development" must differ from mine. Just because they haven't delivered any Signature or regular production Model Xs does not mean that the car is still under development. From Tesla's history with the Model S and the Roadster, development never quite ends. They are always tweaking the design to some extent. So by a broad definition of the term, the Model S is still under development and production is near max planned capacity.
There was a thread here a week or so back where the OP saw a number of Xs at the factory including 6 undergoing final inspection. A number of people speculated Tesla might be building the first batch of Model Xs intended for the demo models at the stores. I think that might be possible. There is also this article:
http://www.teslarati.com/tesla-factory-may-have-a-nitric-oxide-nox-problem/
The article speculates that this problem might be on the Model X production line and is causing delays in spinning up production.
Whatever the issue, building a mass production car is one of the most difficult things to make. The transition from making a handful of cars by hand to making close to 1000 a week is going to run into problems. There is a whole branch of engineering called Industrial Engineering which focuses on the issues with mass production. Something as little as one part 0.1mm out of tolerance on the production line can bring production to a standstill. Bringing thousands of parts together to make a car is tough, doing it repeatedly day in and day out without errors is even tougher.
The Roadster had horrible production problems when it first went into production. The Model S was a very slow ramp up from initial Founders deliveries to full production. The Model X is no different. Elon Musk has admitted the Model X is more complex than it should have been. He also went on to say something like 95% of the car is easy to build, 4% is tough to build, and 1% is excruciatingly tough to build. IMO, the development on the Model X is done, or as done as Tesla cars are ever done. Right now they are ironing out the production problems which don't surprise me at all. This is only the third car they have ever produced (second from the ground up), it's a very complex design, and they are still new to manufacturing.
