Take a look at Jaguar's XKR Goodwood Special

The Goodwood Festival of Speed is a historic UK race event. Here is Jaguar's custom lime green painted XKR. The Goodwood Special XKR is said to have an "unspecified" power upgrade on top of the standard 2010 XKR's 5.0L supercharged V8, which does produce 503hp (375kW).

The Goodwood Special could possibly have as much as 550hp (410kW) or more, though. Some people did notice that this XKR did have a louder exhaust, 21-inch wheels and a lowered ride height.

Could this be an indication of some research and development of the long-rumored "XKR-R?"