Spotted by eagle-eyed Autocar reader Rory Anderson, the car's slim taillights feature a rounded section like those of the sports car. The tailgate also features a slim rear window and a heavily raked top capped with a spoiler.
The new model, which will be officially revealed on 14 June by British tennis star Andy Murray as a rival to the BMW 5 Series Touring and Mercedes-Benz E-Class Estate, will introduce a full-length panoramic roof to the range. Its more practical boot will increase luggage space and rear head room.
Prior to the latest sighting, the car was previewed in three images that showed it driving on roads near the world's most remote tennis court and with former British tennis professional Tim Henman.
Jaguar claims that its new estate will be the "most dynamic premium estate car in the world", suggesting the chassis set-up will be similar to that of the XF saloon rather than being adjusted to offer different handling characteristics.
The XF Sportbrake will be built upon the same aluminium architecture as the saloon, and it’ll also share engines with its sibling, meaning a 2.0-litre diesel will be the entry-level unit, with 3.0-litre V6 petrol and diesel engines sitting above this in the range. The most recently spotted development car was running the 2.0-litre diesel engine.