The heated windshields are new VW Group technology, introduced into Cayennes and Macans for MY2019. I ordered it for my 2019 Macan after seeing it work last winter on de-icing a 2019 Cayenne windshield quickly. It works via silver coatings (no wires visible) in the front windshield, to quickly remove condensation/fog or ice/snow without the use of air, and you invoke it by pushing the rear-window-defrost button. It also gives a cool copper-color look when looking at the front windshield from the outside, and this presumably also helps keep heat out in the summer. I'm very glad that I ordered this new option. I was involved in the discussion thread on EZPass transponders not working with this new windshield, and I had to get a special transponder put on my front license plate. I have no experience with speed radar detectors, and I'll never buy one, so I can't help there.
I would be shocked if the windshield didn't have an ezpass/radar cut out in the same place as the Thermal Insultated Glass on the passenger side of the rear view mirror. But I guess anything is possible. For those that have it, maybe its in the owners manual. If so, post it up I'm interested to find out too.
In my past experience any windsheild that has a metallic film in the glass for infrared blockage or in your case also for heating, blocks radar signals from the detector. I had a Range Rover Evoque with the cut out area. Even when the detector was behind the cut out its sensitivity to police radar was reduced about 30-40%.
Winter is over and for us that ski it was declared over by the COVI-19. I would like a report on how those windshields worked. My second question is is there any way in the world these could be retrofitted in case of a replacement.