It shares code with "flux core" so we can build a new version - in fact, the version on Android is somewhat similar.
What is missing is: the GUI is a volunteer effort, and we need developers to pick it up, and adding all the UI for the new features is not simple.
And yes, it is closed source, but our goal is to avoid people forking our bad assumptions and baking them into their OSes! Not that it seems to help so far. :)