Official pictures of the new Jaguar XJ sedan have been leaked just a day ahead of its official unveiling. The XJ has aerospace-inspired aluminium body architecture and new engines.

Following months of spy pictures, speculation, teasers (including videos) and very little official information, the Jaguar XJ will finally be unveiled tomorrow (Thursday, 9th of July 2009) during an exclusive event in London. That is when more intimate details and full images will be available. For now take a closer look at these leaked pictures.

The next XJ is promised to be the new class-leader in a segment led by the BMW 7 Series and the Mercedes-Benz S-Class, as well as the Audi A8 and the Lexus LS. Jaguar seeks to reclaim its spot alongside these luminaries after years of being sidelined by both buyers and the motoring media.

Jaguar is using aerospace-inspired aluminium body architecture for the first time in a car with the XJ. The technology is next-generation stuff and is likely to filter down into other next-generation Jaguars.

Powerful engines will match or even outperform some of its competitors. Here we can mention engines like the new 275hp (202kW), 600Nm 3.0-litre twin turbo diesel and the 5.0-litre V8 with natural aspiration. A supercharged XJR might use the engine that makes 510hp (380kW) in the XFR/ XKR but have its power upped to keep up with the BMW 760i and the Mercedes-Benz S 63 AMG. Of course this is just pure speculation at this point in time.

Prospective customers will be able to register their orders after 19:30 GMT on Thursday. First deliveries are to take place in early 2010.


Gallery: 2010 Jaguar XJ Photos LEAKED