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Date has passed, but arstechnica.com does not confirm it happened then; unverified.
Electrek reports Tesla's triple-layer titanium and aluminum underbody shield, quoting Musk that "starting with vehicle bodies manufactured as of March 6, all cars have been outfitted with a triple underbody shield," aligning with the pin's stored 5-7 March 2014 date even though the announcement itself was published 28 March 2014.
Techaeris' own headline and 28 March 2014 publish date report the titanium underbody shield and aluminum deflector plates being added to the Model S, echoing Electrek's[2] coverage of the same story, though the page itself could not be verified directly.
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Several test prototypes have already been spotted with camouflaged front and rear ends, suggesting the Model 3 is in for some major visual updates. But Tesla's compact sedan will get more than that. According to a "trusted insider" who offered an exclusive insight to Not A Tesla App, the Project Highland will bring significant changes inside and out.
Starting with the design, the report notes the headlights will have a different shape, which means the front bumper will be redesigned as well. It will be more aerodynamic and will now house a single camera in the center area of the lower grille, in similar fashion to the Cybertruck.
Out back, the refreshed Tesla Model 3 is also getting a redesigned bumper, although the changes will likely be purely for aesthetic reasons.
The source also said the side mirrors will be subtly updated and the Project Highland will be getting more cameras to take advantage of the new Hardware 4.0 Autopilot supercomputer. Three new cameras will reportedly be added to the Model 3: one in the center of the front bumper and two on the sides of the car.