The official debut can't come soon enough.

One of the most popular cars among spy photographers, the hotly anticipated BMW M5 has been spotted yet again in its natural habitat – at the Nürburgring. The super sedan was undergoing final testing ahead of an expected reveal slated to take place in the following weeks. Some will remember more than a month ago, BMW’s M division organized a preview event in Belgium to show off its E63 rival.

Revealed:

Naturally, some juicy details emerged from that meeting, like output of the biturbo 4.4-liter V8. It will churn 600 horsepower (441 kilowatts) and 516 pound-feet (700 Newton-meters) channeled to the wheels through an eight-speed automatic transmission. It’s going to be enough M muscle for a run to 62 mph (100 kph) in less than 3.5 seconds. Top speed? It’s not known at this point, but the digital speedometer of the car shown to a select audience topped out at 330 kph (205 mph).

We already know the M5 will use a new version of the xDrive system capable of allowing the driver to switch to a tail-happy pure rear wheel drive mode at the press of a button. Other goodies on the menu include carbon ceramic brakes, a button to alter the exhaust note, and a sportier gear selector. Needless to say, it will also boast a slightly more aggressive body compared to the current range topper, the 2018 M550i we had the pleasure of reviewing a couple of months ago.

According to BMWBLOG, the new M5 will be revealed in full at some point next month, prior to being exhibited in the metal at the Frankfurt Motor Show. Once again, the high-performance midsize model will be available strictly as a sedan, so those in need of a bigger trunk will have to give Alpina a call and place an order for the B5 Bi-Turbo in the Touring guise.

In terms of pricing, expect to pay significantly more than the M550i available in the United States from $73,400 MSRP before adding any options.

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2018 BMW M5 Prototype