Mercedes held its annual results conference this week, outlining how it intends to become "leaner, faster, and stronger." The theme of its new roadmap is "mastering transformation," and it's not just marketing fluff. The three-pointed star has a busy agenda, which includes planning electric C-Class, GLC, and E-Class models and a "major upgrade" for the S-Class. The flagship will retain one of its most important assets–the V-12 engine. The German luxury brand is expressing its long-term commitment to the venerable twelve-cylinder powerhouse, but the twin-turbo 6.0-liter engine will continue only in "selected markets." Presumably, in regions of the world where…