While this mule doesn't show us the styling of the new electric sedan, it does give us clues about its relative size.
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An engineering mule for the next-generation Jaguar XJ has been spied during cold weather testing in northern Europe.

Given this mule uses panels from the current XF sedan, it doesn't provide us with a look at the final design of the new XJ, but we can tease out a few details about the new range-topping sedan.

Thanks the XF-derived body panels, we can see the new XJ is a larger vehicle with a longer wheelbase and a wider track. It also features a faster roof line and a long bonnet.

In September last year Jaguar teased the design of the XJ's boot lid and tail-lights, which features a squarer and more technical take on the company's current styling theme.

Last year Jaguar confirmed the new XJ will be an all-electric model in a bid to set it apart from the Mercedes-Benz S-Class and BMW 7 Series, which dominate the sector globally.

Under the skin, the XJ will be the first car based on Jaguar Land Rover's new Modular Longitudinal Architecture (MLA) architecture, which is designed to support plug-in hybrid and all-electric powertrains, as well as traditional petrol and diesel engines.

In time MLA will be used as the basis for most Jaguar, Land Rover and Range Rover vehicles.