ShanghaiMercedes-Benz GLA Concept to be Unveiled in ShanghaiThe humongous Shangai Auto Show opens its doors next Sunday, and amongst the many unveilings we find the Mercedes-Benz GLA, a concept vehicle that appears very nearly production-ready. This will be the world premiere of this compact luxury SUV, whose production version will go head-to-head with the Audi Q3, BMW …