A redesign for Audi's flagship sedan is due in June.
It competes among the world's largest and most luxurious sedans.
It recently lost a unique asset, now that a Mercedes-Benz S-Class can be had with all-wheel drive.
Notable features include a continuation of the aluminum body and a strong 4.2-liter V8.
The standard model will be the long wheelbase version that has a roomier rear seat.