Evergreen is a living system, which means we are constently making updates to it. You can learn more about those changes, and up coming ones here.
Evergreen v5 is a general health check for the framework. We took a look at what makes Evergreen tick and compared it to new standards. We made several updates to try and push the DevX of using the framework to be a lot more natural and robust. We focused on improving bundle size, performance, tree-shaking support (especially for icons), and better TypeScript definitions.