The new 45 model will start being built from week 44 onwards so if you car is being built next Monday then it’s most likely you’ll still get the current 40 model. I phoned my dealer about my order and they said I can’t change the advance payment since it’s locked in and if I cancel then I’d go back to the end of the queue. I think my dealer is clueless tbh. It should just be an admin change for the reduced AP and shouldn’t affect the order with Audi.