Mercedes-AMG will take a leaf out of the Audi RS6 Avant’s playbook for its next E63 AMG Estate, with the next generation model of Benz’s hard-core family hauler set to grow a massive set… of wheel arches.

Spied by YouTube user WalkoART while conducting public road testing in Europe, the new E63 AMG Estate’s engorged fenders are there to accommodate a set of ultra-wide wheels wrapped in low profile rubber. Viewed from the rear, the stance is low, squat and supremely aggressive – and not too dissimilar to Audi’s famously fast RS6 wagon.

The reason for its girth comes down to its mammoth power output. A leaked Russian dealer document revealed the new E63 S will smash out a stunning 450kW of power and 850Nm of torque – enough to take it to 100km/h from rest in a supercar-like 3.5 seconds.

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The “regular” E63 sedan and wagon will generate a slightly less ballistic 420kW and 750Nm, with a 0-100km/h sprint of 3.7 seconds.

All E63 variants will be exclusively all-wheel drive, meaning the rear-driven E63 S currently available in Australia will be the last of its kind.

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The flares and big wheels are new then, but is it the rumoured E63 Black Series that has car forums buzzing?

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Rather, it looks like this will be what the regular E63 Estate will look like.

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We won’t have long to find out, though. The E63 sedan is slated for a Paris Motor Show debut at start of October, with the Estate expected to make its first appearance not long after. Both are expected to go on sale locally next year.