Toyota Motor Corp's Lexus luxury unit will introduce a new model in China, the world's largest auto market for the second straight year, signaling the division's growing ambitions for the crucial market. The refreshed ES sedan is being premiered in Shanghai this month and the world's largest carmaker hints that its retuned strategy will focus more on the Chinese market - where Toyota has been riding stormy waters in recent years - also because of the continued political tensions between Beijing and Tokyo.