After all the attention surrounding the launch of the XF, Jaguar is now turning its thoughts to the XJ range, spotted here in test mule form.

Carrying on the look seen in the XF, the production XJ is due in late 2009 with an edgier design.

XF designer Ian Callum cites the Mercedes-Benz CLS as an inspiration to modern large saloons, so expect a similar low-slung look but with Jaguar’s new squarer grille and jazzy LED lights.

Under the surface, things aren’t likely to change much. That means the existing chassis and the acclaimed 2.7-litre TDVi V6 diesel engine will stay.

Jaguar XJ caught testing