BMW has released a shadowy teaser image of a new open-top sports car concept set to debut on August 17 in Monterey, California.

The car is set to be the automaker’s star attraction at the 2017 Pebble Beach Concours d’Elegance taking place on August 20.

The concept is thought to preview the new Z4 that BMW is developing alongside a new Toyota Supra. Other possibilities could be a preview of the upcoming i8 Roadsteror more distant 8-Series Convertible, though the size and profile of the car in the teaser more closely resembles prototypes for the new Z4.

It was originally thought that the Z4 would be adopting a Z5 moniker as a mark of higher positioning, but Ludwig Willisch, the soon-to-be-retired Head of BMW Group Region Americas, told Autoguide in May that that wasn’t the case.

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