Like all of the latest-generation Audi models, the facelifted Audi S4 features a softer and slimmer front grille and headlight design. The S4 also gets a revised front bumper layout, incorporating a sportier, more aggressive look.
As far as engine performance goes, no details have been leaked yet. The 4.2-litre V8 might make it's way into the S4 range, handed down from the current RS4. A revised supercharged V6 could also remain under the bonnet. We'll have to wait and see.
Interestingly, the test mule spotted on the 'Ring also appears to feature a full roll cage set-up inside the cabin. From some angles you can see the windscreen bars trailing down the A-pillar at the front.
Either Audi is truly punishing the car on the track to get the most out of it or the company is planning to release a GT3 version, although it's not very likely.
Reports say the finished product of the Audi S4 facelift will debut at the 2011 Frankfurt Auto Show in September.