BMW has published a final preview of the upcoming Z4 on social media ahead of the car’s reveal in the metal this weekend at the Pebble Beach Concours d’Elegance. The all-new Z4 is expected to share many of its mechanicals, with the possible exception of engines, with the upcoming Toyota Supra.

What can we infer from the latest teaser image? It appears BMW is aiming wider and lower for the new Z4; the previewed prototype features a flat hood, wide wheel arches and a wide stance. The kidney grilles appear stretched horizontally in comparison to other current BMW models, and the doors retain the hockey-stick character line that debuted on the first-generation Z4, to some mixed reviews.

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“The concept expresses the new BMW design language from all perspectives and in all details,” said Adrian van Hooydonk, senior vice president BMW Group Design ahead of the prototype’s reveal. “From the dynamic-looking front to the striking flanks to the clean-cut tail end: a few lines and the subtle interplay between surfaces are enough to generate a sense of power and emotion.”

The car that will debut at Pebble Beach will still be a prototype, but we should get a better sense of the engines that BMW will offer in the Z4 this weekend. Four- and six-cylinder turbocharged engines are expected in the Z4, but it’s not clear at this point if Toyota’s version will receive these or drop its own powerplants into the Supra.

The Z4 prototype won’t be the only Pebble Beach concept from BMW; the 8-Series will signal its return with a concept of its own.