Evomail+ isn't an update to Evomail but rather an entirely new email app designed specifically for iOS 7. The redesign makes use of new OS features like background syncing, dynamic text, external keyboard support, and more. It also provides users with a sleek new (customizable) interface that revolves around a single primary button that will perform a number of different actions contextually. In short, it's designed to make email easier.
You can download Evomail+ for free right now. Or you can feel check out the video below to see exactly what this contextual button is all about.