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"Fourth version of Tesla technology" MI03 vs MI04?

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Anyone figured out what changed yet?

I ask because Tesla just bought back my car and have one that was built two weeks ago sitting in Fremont that's the exact config I want, but is still a "100D" not "Extended Range" and is code MI03, not the newer MI04 people are now seeing.

The Tesla site mentions in the "Model S and Model 3 are both designed to be the world’s leading cars in their class, built upon the fourth version of Tesla technology." If that means the new battery pack and other things, I wonder if the discounts I'm getting on this particular care are worth it if it's based on an older tech platform.

Thoughts?