Typical spark plugs are required for combustion, but the tech allows for a switch to diesel-style compression ignition. In other words, the spark plugs are used for consistent combustion, allowing for gasoline engine performance with diesel engine-like fuel economy. We also spoke to Mazda Europe design director Kevin Rice last March at Geneva and he strongly hinted the new 3 will look an awful lot like the gorgeous Kai Concept. We can easily live with that. The interior will also represent quite a significant leap forward compared to the current and previous generation models. Even higher quality materials and fit and finish are expected.