I agree. My 3 was delivered in the 3rd week of May and it appears to have something that looks like weather stripping in the channels in front of/behind the front piece of glass. There's far less sound at 70-80mph compared to my Prius Plug-in and the A3 hatchback my wife had a couple years ago.
My guess is the thin seals allows any water trapped in the channels to expand without cracking the glass, and it also prevents too much air from entering the channels and causing pressure drag, which can be noisy.
If anything, the majority of sound comes from the rear of the car near the trunk, which I'm relatively certain is pressure drag.
Can you post a picture of the weather stripping?