Filed under: Hybrid, Ferrari Ferrari 612 replacement test mule - Click above for high-res image gallery It's long been suspected that Ferrari was hard at work developing a hybrid powertrain for its line of supercars and grand touring machines, especially since a series of patents were located proving that the Italian automaker had at least sketched plans for such a system. Still, Ferrari had never confirmed such rumors.But, according to Autocar in the UK, an unnamed source tells the...