BMWBlog has published several official images of the 2014 BMW 4-Series Convertible. The manufacturer didn't release any technical details, but we expect the same engines, which are offered for the coupe: 420d, 428i, 435i.The exterior doesn't come with any big changes. After all, the 4-Series Convertible will be exactly the same as the Coupe, except a retractable metal roof and some reinforcement for the chassis. Still, BMW is going to use lightweight materials in order to keep the total weight as low as possible.The 2014 BMW 4-series Convertible will make its official debut at the 2013 Los Angeles Auto Show.Stay tuned!