Audi is to launch an A4-based coupé in 2007. The range-topping
RS5, Audi's answer to the M3, will get Audi's 4.2-litre 420bhp V8 and quattro rear biased 4WD
The car will be of based on a new flexible platform that will be also used in next A4 and A6.
Engines will start form a 2.0 FSI with 150 hp.
Source:
http://www.autocar.co.uk/