We still have a long time to wait for the new BMW M3 and M4 to arrive. The new 3 Series was unveiled last year at the 2018 Paris Auto Show, and the new 4 Series is expected to show its face by the end of this year, but the new M3 and M4 aren't expected to break cover until the middle of next year. To whet our appetite, BMW presented the Concept 4 at the 2019 Frankfurt Auto Show last month, which previews the next-generation 4 Series, M3, and M4.

Not everyone is enamored with BMW's styling direction, however, as the Concept 4 featured a significantly larger kidney grille than the current 4 Series. You better get used to it, because BMW has implied these styling changes will carry over to the production 4 Series to help distinguish it from the new 3 Series.

To help us understand how these styling changes will translate to production models, our spies have spotted a camouflaged prototype of the new M4 Convertible. This isn't the first time we've seen the next-generation M4 convertible, but this time our spies managed to get up close and personal with the droptop M4 as it was parked up.

In case you were wondering, BMW hasn't tested the coupe version of the M4 yet, but our spy photographers have already spotted the new 4 Series Coupe out in the wild. Hopefully, it won't be too long before we get our first look at the new M4 Coupe. Once again, the new M4 Convertible was spied with a fabric roof that will replace the current model's metal folding roof.

There's still camouflage concealing the design details, but the kidney grille looks larger than current M4, and we also get a good look at the model's large sporty wheels. At the back, quad exhaust tips confirm we're looking at the hot M4.

Under the hood, the new M4 will be powered by a 3.0-liter twin-turbo inline-six that will reportedly produce 473 horsepower in the base model, which will be available with rear-wheel drive only. The range-topping Competition model, on the other hand, will allegedly increase the output to 503 horsepower and feature an all-wheel-drive system that can be switched to rear-wheel drive on the fly, just like in the M5. Purists can also rejoice because BMW has confirmed the new M3 and M4 will have a manual transmission.