Volkswagen marketing gurus have taken to calling the coating "Low-E" for low thermal emissivity. How does it work? Details are scarce at the moment, but the manufacturer is saying the compound helps to keep heat from radiating skyward, essentially keeping the glass just a bit warmer than the ambient temperature. While the Low-E tech won't guarantee against fogging or frosting, it does greatly reduce its likelihood.
So how long will it be before the windshield in your new Jetta is immune to Old Man Winter's shenanigans? No one is saying for sure. VW is still ironing out a few kinks at the moment, including the fact that the indium tin oxide wreaks havoc on both radio and cell phone signals.