Wearing Vantablack paint, it's part of a new camouflage the marque is testing.
We've seen innovative approaches to car camouflage in our time. Most manufacturers tend to use a white or gray wrap with busy black or gray lines strewn in an apparently haphazard manner. These are intended to disguise the lines and curves of the pre-production vehicle they are applied to, but lately, we've been seeing other methods. Mercedes uses a multicolor wrap on test mules of the AMG One and Audi did something similar with the e-tron GT. These methods may be effective, but Ferrari seems to be making them obsolete. In the below video, Ferrari has painted (not wrapped) a car we already know about as it tests Vantablack as a method for hiding the car underneath.
According to the script seen in the video, Ferrari's choice of Vantablack paint on this SF90 Stradale seems to be very effective, obscuring lines and curves in low light and causing focusing issues in good lighting. Presumably, the most effective way to use this technology is to paint only certain parts of the body with the stuff, thus making the car morph in an optical illusion that could disguise proportions as much as design cues.
As cool as this is, we always have to consider the possibility that Ferrari is doing more than just testing the paint. Could a hardcore version of the car be coming?
It is certainly not unlike the modern Ferrari brand to squeeze every last drop of money it can out of a model - we've seen the F12berlinetta followed up by the F12 TDF, which was then replaced by the slightly different 812 Superfast. That has since received a special attention too, becoming the 9,000-rpm 812 Competizione with the world's most powerful V12.
We haven't been given any hints that such a special edition of the SF90 is coming, so this could also be a testbed for its successor. Either way, spy photogs will be cursing Ferrari for years if this catches on. We kinda hope it does - the internet has ensured that it's rare for manufacturers to be able to surprise us these days.