This is a code name of a new renderer that will make the size of the app smaller and the compilation faster. The size of the Hello World app is only 3KB gzipped.
Bazel and Closure Compiler
Component Dev Kit (CDK)
CDK is already used by the Angular Material library, which offers 30+ UI components. CDK allows you to build your own library of UI components and control page layouts. It also supports Responsive Web Design layouts eliminating the need for using libraries like Flex Layout or learning CSS Grid.