Still Open Source?
It seems like the Scene graph is no longer open source. The last change to Scene graph was committed 4 months ago. It seems a little odd that no changes was committed to Scenegraph the last 2-3 months before the launch of the JavaFX project (as the JavaFX platform uses Scene Graph).
Another thing that hints that the Scene Graph might not be a open source project any longer, is that Scenario.jar (The Scene Graph jar file) used the JavaFX seems to be slightly larger than the one checked out from SVN. And there seems to be more classes in the JavaFX version.
I really hope that someone (from Sun) could tell the community what is going on.