Are we talking about intense condensation that the heated screen can't clear? If so I have seen this with previous cars. It's worth checking out with Audi for sure but I think it's a symptom of the super sealed cars we drive these days.
For me it has usually occurred after a day in which the inside of the car gets warm (sunshine, heating on, a few short runs and there is a drop in outside temperature. The moisture in the air inside the car then condenses on the cold windows.
You need to use the aircon/climate most of the time. It's there to dry the air out not just to keep an even temp or cool down in the summer. When it's very foggy inside you need to wind the windows down first and let the warm moist air out and some fresh air in for a few minutes.
Like I say it'll be interesting to see what Audi say but I think it's just down to basic physics. The aircon will be up to the job as I've seen VAG testing their cars in the Nevada desert!