The M8 convertible has all the style of the existing droptop with a lot more power.

The BMW M8 Coupe, Gran Coupe Saloon, and Convertible are on the way, and a new spy video catches the last member of that group while it's taking a break at a petrol station near the Nürburgring.

Gallery: BMW M8 Convertible Spy Shots

The M8 Convertible (earlier spy shots above) looks a whole lot like the standard droptop 8 Series, except with slight tweaks like a larger centre intake in front and more prominent rear diffuser. The brakes look fairly normal, but they actually have a sophisticated module that combines the activation, booster, and controller into a single part, and BMW claims the tech saves about 2 kilograms. The system even adjusts the amount of force that's necessary on the pedal to slow down depending on if the vehicle is in Comfort or Sport mode.

BMW already confirms that the M8 has a sophisticated all-wheel-drive system like the M5 that allows owners to operate it in a fully rear-drive mode, if they want an easier time of kicking out the tail in the corners.

Powertrain details about the M8 aren't official yet, but we have a good idea what to expect. Look for BMW's twin-turbo 4.4-litre V8 to make around 600 bhp in the base model and 617 bhp in the more potent Competition grade.

The standard 8 Series Convertible will make a public debut at the Los Angeles Auto Show at the end of November. Don't expect the droptop M8 to arrive until several months later, though. If you don't want to wait, BMW is already starting the official teaser campaign for the M8 coupe, so an unveiling shouldn't be too far away.