D4 (2011-)
It is anticipated that a third-generation Audi S8 is expected to go on sale as a 2011 model year, released one year after the all-new 2010 Audi A8. The S8 is expected to use the 5.0 litre FSI biturbo V10 engine, which currently powers the Audi RS6 (C6) with 427 kilowatts (581 PS; 573 bhp). This means that the new S8 will push about 700-730 bhp if tuned by MTM or other chip-tuning companies.[dubious ][4][5] But there a many references on the internet that it might use the V8 from the 2011 Audi RS5.
SOURCE TO:http://en.wikipedia.org/wiki/Audi_S8
