In the shot, we see the rear lighting extending far to the sides in a line that extends across the entire rear of the vehicle and culminating in a tight arc back onto the liftgate. Below, we see the gleam of the three-pointed star badge. At the top, we see a brake light underneath a spoiler behind a gently arcing roofline. Then the shot goes dark.
The clip is further evidence that the car will actually use the letter "C" in its moniker. The filename "W239_EQC_Exterieur_Heck_2" is a bit of a giveaway.
It seems likely that Mercedes-Benz will continue the trickle of mystic teasers ahead of the reveal. We'll be happy to see the finished product in its entirety on Tuesday.