Described by the company as a 'coupe', the car has also officially been given its name, Evoque.
It will be available in 2WD and 4WD variants, with a sub-130gm/km emissions performance.
The official debut will take place at the Paris Motor Show in September. The car goes on sale in summer 2011. It is aimed to be a global model and will be sold in 160 countries.
Tonight's preview took place in Kensington Palace. Here's the launch. Our Trish Whelan was there and we'll have a full report and pictures in due course.