A pre-production version of Jaguar’s answer to the Audi RS6 and BMW M5 made an unexpected appearance at last weekend’s Goodwood Festival of Speed. Luckily for us, a couple of quick-handed spectators managed to film the XF-R in action. Sources state that Jag’s new high-performance sport saloon will be powered by a new direct injection, supercharged 5.0-litre V8 engine delivering something north of 500 Hp. You can also see a picture of the 2010 Jaguar XF-R here.