Audi’s Q6 E-Tron is yet to be revealed but already a hotter version from Audi Sport is being tested in public view. The prototype in our latest spy shots, caught testing recently at Germany’s Nürburgring racetrack, is for an expected RS version of the Q6 E-Tron, a vehicle that will likely go by the name Q6 RS E-Tron. Audi Sport already offers…