Every two years the massive Messa in Frankfurt, Germany plays host to one of the largest, if not the largest auto show in the world. Twelve huge buildings with another constructed just for that event alone, it’s the center of the automotive universe for those days in September. This backyard advantage provides the hometown German automakers with the opportunity to impress the auto world with displays the size of zeppelins filled with cutting edge concepts. John McElroy anchors Autoline this week from the site of this biennial show getting the latest from executives for three important German brands, including Jonathan Browning of Volkswagen of America, Ian Robertson from BMW AG and Johan de Nysschen of Audi America.