This first article in a series has three Daimler brands as its focus. What is to become of Denza, a JV between the German group and China's BYD? The same question can be asked about smart, which Daimler is restructuring as part of an alliance with Geely. And then there is Mercedes-Maybach, a sub-brand which has already been through its own reinvention. In all three cases, future models are key.