The Audi RS Q3 was caught racing around the Nurburgring recently. The reason for this testing could be a couple of different things.
The first possibility is that Audi is working on the powertrain because of commotion with Mercedes. "The GLA 45 AMG is already receiving most of the praise from the industry and will likely get a 20 PS boost after the A45."
Audi may also be trying to figure out how to export the RS Q3 so that it can compete with the GLA 45 AMG in the States.
Finally, it ma be that Audi is beginning work on components for the next Q3 that is scheduled for release two years from now.
Oh, it could also be that Audi is trying to break some type of record at the Nurburgring.
Your guess is as good as mine.