There's some serious conjecture involved here - but this might be our first view of Jaguar testing its forthcoming hybrid platform technology, albeit in the somewhat unlikely guise of an XK.
The car was photographed testing at the Nurburgring, where our spy photographers reported that it was uncannily quiet - without the V8 soundtrack you'd expect to hear from a hard-working XK.
Of course, it might just be a particularly well-silenced mule for the forthcoming facelift of the XK - o...
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