DETROIT/PARIS (Reuters) – Cadillac’s new boss plans a blitz of new products by 2020, from a pure battery-electric car to an ultra-luxury sedan, that he hopes will help resurrect General Motors’ (GM.N) struggling premium brand and make it a global powerhouse. Johan de Nysschen, a former Audi and Infiniti executive who joined GM in August, shared with Reuters some key elements of his plan to revive Cadillac, in an interview last week at the Paris auto show.