These photos were snapped by a fan of our spy photography agency in southern Europe, and give us our first good look at the new sedan's overall shape.
The production car's detailing, however, is well disguised by a series of false body panels over the doors, fenders and boot.
Although it seems an odd choice for a mule body, the two cars are actually built upon the same platform. Dubbed MSB, the new Porsche-developed rear- and all-wheel drive architecture will form the basis of Bentley's sedan, coupe and convertible range over the coming years.
From the earlier spy photos, we know the new Flying Spur will be longer and wider than the Porsche Panamera Executive, which is 5.2 metres long and rides on a 3.1m wheelbase.
In addition to improved proportions compared to today's Flying Spur, the new platform should result in a lighter sedan. With high-strength steel, aluminium and other lightweight components, the new Flying Spur will be less portly than the 2475kg behemoth plying the roads today.
While range-topping versions of the new Flying Spur will likely use an updated version of Bentley's 6.0-litre twin-turbocharged W12, entry-level variants will probably be powered by a version of the Porsche's 404kW/770Nm direct-injection 4.0-litre twin-turbo V8.
The new Flying Spur is expected to make its global debut in either late 2018 or early 2019.