Power is expected to be provided by an updated 6.75-liter V8 engine with at least 550 horsepower.

Sibling rivalry? Illusions of grandeur? We aren't sure, but our spies have managed to catch the upcoming "Grand Bentley" disguised as a Rolls Royce.

While the odd camouflage hides much of the car's styling, we can see several details including the Grand's massive LED-infused headlights, Continental-inspired taillights, and a C-pillar that mimics the beautiful Bentley Brooklands. Even with these new spy photos, our best glimpse of the car still comes from several smuggled images taken at the company's headquarters in Crewe.

Power is expected to be provided by an updated 6.75-liter V8 engine with at least 550 horsepower and 800 Nm of torque. This should enable the all-wheel monster to run from 0-60 mph in under 5 seconds, before hitting a top speed of 200 mph (320 km/h).

Unlike the outgoing Arnage, the new Grand Bentley will only be offered in one wheelbase. While this many disappoint some wealthy clients, the move helps Bentley keep costs down and speed up production.

Look for the new Grand Bentley to be officially unveiled at the Pebble Beach Concours D'Elegance on August 16th.

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Grand Bentley Prototype Caught Disguised as a Rolls Royce