Update: Motor1.com readers Mark Brady and Steve Blendermann also caught Audi SQ5 prototypes in the mountains.
Their images are shared here with permission; we can clearly see quad exhaust outlets at the rear. A side view also offers a good look at the wheels shod with low-profile tires. Thanks for the photos, Mark and Steve!
Photo Credits: Mark Brandy and Steve Blendermann
Audi is currently testing three vehicles at high altitude in the Colorado Mountains. These vehicles appear to be the next-generation SQ5 and possibly two examples of the new S5 Avant. TFL Now managed to capture footage of the three cars leaving a hotel and entering the interstate. All three vehicles feature quad exhausts, with two on each side, which indicates that they are all S variants.
The gallery below shows the Audi SQ5 being tested in Europe. In the video, the front of the vehicle being tested in the Colorado Mountains is not shown clearly, but they share similarities in terms of profile and rear design. One of the main similarities is the sharp taillights.