Your last paragraph is interesting. I'd assign a very high probability (over 90%) to the inclusion of the P100D data and images in the new firmware to laziness/routine and a low probability (less than 10%) to it being suggestive of them redoing a 40/60 thing (starting to put in 100 packs in 90 cars and then offering a "software" upgrade/unlock for a price). If they did redo a 40/60 "hidden" upgrade though it would be a strategy to mitigate Obourning effects way in to the future: create the story/notion that when you buy a Tesla you'll be getting what you're buying plus possibly whatever new stuff they're working on, and this stuff will be made avail to you later, either free or at a price.
I must admit the 10% case had crossed my mind. *IF* (big IF) the actual technology jump was really from 85 to 100 (and masked to look like "just 90"), wouldn´t that point to chemistry features they might want to reveal at a time they choose in the future? Not up to date on the battery tech just WAGing. But don´t want to start rumours based on hardly anything