What does “final” mean? Stability that’s been validated across a wide range of use cases, and a framework that’s been optimized for developer productivity, small payload size, and performance. With ahead-of-time compilation and built-in lazy-loading, we’ve made sure that you can deploy the fastest, smallest applications across the browser, desktop, and mobile environments. This release also represents huge improvements to developer productivity with the Angular CLI and styleguide.

– Reed the tweet