BMW Teases Roadster Concept Ahead Of Pebble Beach Unveiling BMW has issued its first teaser of a roadster concept that’s set to take centre stage at the upcoming Pebble Beach Concours d’Elegance later this month.   The as-yet unnamed concept is widely tipped to preview the design of the brand’s Z4 successor. As is so often the case with teaser sketches BMW has been careful to reveal little about the concept’s final form, though the moody silhouette displays classic roadster proportion with a low bonnet, long dash-to-axle ratio (the space between the front wheel and the front door), and a short rear deck. The roadster also appears to show a svelte low windscreen and integrated rear roll hoop structure, with a…