Developments are still happening with the ID.3 and this spotting might indicate what's to come, although vague.
"Instead of two engineers with computers and other pieces of equipment for measurements, we first see a couple inside the ID.3. They would seem to be going to a party if it was not for the place in which the video was shot: just outside of Nürburgring Nordschleife, at the entrance of the track. Then, if you look closer, you will see a second man on the back seat, right behind the driver.
Were they trying to see how fast the ID.3 First Edition is? Why doesn’t it have the charger port cap? Is the lack a sign of first issues with the vehicle?"
(quoted from https://insideevs.com/news/385053/vw-id3-filmed-outside-nurburgring/
For all we know this could be for regular testing of regular models, or something more.