An official looking document from Audi contains detailed information and on sale times for future Audis. Of course, not everything on the web is correct, so you will have to wait and see if it was the real thing.
Audi finishes 2008 of with the A6 facelift, RS6 sedan and Q5 introduction in October. The Q7 with the V12 TDI comes out in December.
2009 turns out to be an even busier year for Audi with the A5/S5 cabriolet and Sportback, S4 sedan and Avant, A7 Sportback, A4 Allroad, the R8 V10 (525 horsepower), and the new A8 debuting. The Q7 also receives a facelift. The A1 comes a year later in March of 2010. The Q3 mini SUV comes in 2010 as well.
Most interesting are the engine specifications. The S4 comes out next year with the 333 horsepower 3.0 TFSI. The RS5 will come in 2010 with a 450 horsepower V8 FSI. The A7 Sportback will debut the new 300 horsepower V6 TDI, while the S7 Sportback will come with a 394 horsepower 4.0 V8 TFSI. The new A8 will feature a 372 horsepower 4.2 V8 FSI and come with the 8 speed automatic.