Preview: 2009 Audi S7

Audi is preparing a new four-door coupe positioned between its A8 limo and A6 models and, as with any new Audi, there's invariably a performance "S" model. Aimed at the segment starter, Mercedes' svelte CLS saloon, the new A7 should arrive on the market in early 2009 and will be joined by a convertible version one year later.Standard models will get the usual assortment of FSI and TDI six