With the new Jaguar XF sedan in the can, it's time to turn our attention to the R version. That's the one that had better get close to the Germans' AMG and M hardware, or else lose face. Now, spy photographers have caught this duplicitous test mule that sports the front of an XF on the body of an S-Type. But it's not just any S-Type — the quad exhaust, fat meats and cross-drilled disks give away its sporting underpinnings. We're assuming the latest supercharged incarnation of the Jag 4.2-liter V8 is cloaked under that Frankensteinian bonnet. We'll see the product n 2008. [World Car Fans]