Porsche released a teaser video for the Mission S, a new concept car that previews what is expected to be a new supercar line above the 911.When it reaches production form, the Mission S will be equipped with a flat-eight engine and could be positioned against competitors like the Ferrari 849 Testarossa.The new model is part of Porsche’s revival plan aimed at lower-volume, higher-margin products, with the goal of making more money while building fewer cars.