For those of you wanting to play with PBJ, the full code-base is available over on GitHub in the PBJ repository. Just to be clear, this is for people that want or need to edit, view, or make contributions back to the code. You don’t need to do anything with Git/GitHub if you just want to consume the library out of Maven or otherwise include the JAR file in your projects.
That said, there are a few things missing from the library that are available in the PBCS REST API, such as some items having to do with Planning Units, and some new REST API methods that are going to be available soon (having to do with data slices). But in the meantime, enjoy!