I also have a crack in the windshield. I visited the dealership yesterday, and it doesn't appear they will cover it under warranty. They implied that any cracks should have occurred shortly after taking possession of the vehicle. However, if I wanted, I could take it to the service manager who would make a determination on whether to call out the regional VW rep who would make a determination for warranty coverage on a case-by-case basis.
I decided not to hassle with this and jus deal with my insurance company. Supposedly, a new windshield will be ordered and installed instead of having the crack filled. The windshield from the VW dealership was on backorder, and the cost wasn't as high as I thought (~$450) but I'm sure labor would be pricey.