I've just taken my car into Audi for a cambelt change and the service guy gave me a printout of a recall on my car.
Its for dodgy ignition coils, so they'll be replacing them free of charge.
I never received a letter from Audi informing me of the recall.
My car is a 2006 2.0T and apparently most petrols around that age and engine size have potentially faulty coils.
Worthwhile giving your dealer a call to check if yours needs it too.