GM's badge-engineering fairy may again slip a little something under Saab's pillow. Rumors have it that the company will unveil its own version of the Solstice/Sky roadster franchise, tagged with the Sonnett Sonett name — last seen on Saab's V4 sports cars of the '60s and '70s (1969 Sonnett pictured). Word is, the concept will debut at next year's Geneva motor show. Shall we compare it to a summer's day? Or will summer's lease hath all too short a date? Only GM's inner circle knows for sure.