2017 M5 is expected to be offered with an optional all-wheel-drive system for the first time.

The 2017 BMW M5 has been spied near the company's Nürburgring testing center.

Despite being dressed in heavy camouflage, there are several telltale signs that confirm this isn't your ordinary BMW 5 Series.  Starting up front, we can see a stylish twin kidney grille and a large lower intake with mesh inserts.  The sporty styling continues further back as the prototype has lightweight alloy wheels that are backed up by a high-performance braking system.  If those clues aren't obvious enough, the four-tailpipe exhaust system provides a pretty strong hint that something powerful is lurking under the hood.

Speaking of the latter, the M5 is expected to have an upgraded version of the company's 4.4-liter M TwinPower Turbo V8 engine.  It currently produces 560 horsepower but previous reports have suggested the new engine could develop up to 626 hp. The extra power, combined with a rumored weight reduction of up to 220 pounds, should enable the M5 to accelerate from 0-60 miles per hour in less than 4.0 seconds before hitting a limited top speed of 155 mph.

Customers who live in cold climates won't be left out either as the 2017 M5 is expected to be offered with an optional all-wheel drive system for the first time.

Gallery: 2017 BMW M5 spied with less disguise