World Car Fans has a hole host of new photos of the next-gen S4 caught testing in Sweden. Unconfirmed for production, the mules feature
A4 S-line body work with quad tailpipes and Audi's current standard S-car 5-spoke wheel.
The WCF article says a V8 for the S4 and we are pretty sure that's incorrect. Expect a supercharged V6 dubbed 3.0 TFSI as per our article from November. One of the WCF commenters at the bottom of the linked page seems to have heard a similar story we've heard from our sources.