Audi has begun series production of the new A3 Cabriolet at its Gyor plant in Hungary. The model will be exclusively produced in the Hungarian plant, as is the case temporarily with the A3 Sedan, until Chinese and Brazilian production start late this year and in 2015, respectively. Order books for the second-generation Audi A3 Cabriolet open today in Germany and other European markets, with deliveries in…