The A7 unveiled last week in Munich puts Audi in a growing segment of four-door luxury sedans that have expressive, coupelike styling.
The car will be positioned between the A6 and A8 and will be in European showrooms from November, with prices starting at 51,650 euros ($67,140) in Germany.
U.S. sales begin in mid-2011. U.S. prices haven't been announced.
The A7 will compete with the Mercedes-Benz CLS, Porsche Panamera and Jaguar XF. Drawing heavily on Audi's earlier Sportback concept, the A7 has a short front overhang and long hood. The rear end drops off sharply, giving the car a sleek appearance similar to the A5 coupe.
To reduce weight, aluminum is used extensively in the body.
The A7 is part of Audi's strategy to make premium sedans, including the A6 and A8, account for 30 percent of its U.S. sales within six or seven years, up from 15 percent today. Worldwide, 25 percent of Audi's sales are of premium sedans.
"The A7 represents an avant-garde and premium-priced alternative to the A8," Johan de Nysschen, president of Audi of America, said in an interview.
The A7 will be built at Audi's Neckarsulm factory in Germany.