Apparently, we'll find out what this all means on October 9th.
The picture shows a garage door with a big letter “D” on it, and we can see through the narrow opening the front of a (new?) Tesla.
Some have speculated that the recently announced Model 3 compact sedan could be renamed “Model D,” while others say it could be a smaller CUV than the upcoming Model X.
According to CNN Money, the most likely explanation is that the “D” either refers to a driver assist feature or some kind of all-wheel drive for the Model S, which to this point has been rear-wheel drive only. Also, Musk previously stated that Tesla was working on an autonomous driving technology for the Model S.
As for that “something else,” we don't have a single clue. Next Thursday can't come soon enough!
Source : techcrunch.com