Hi Tom, hi Joram,
I'm happy to announce that the Signavio Core Components are now available.
It has the nearly the same features as the old signavio oryx initiative, but with some enhancements and both the repository as well as the build process is cleaned up. Building the modeler is much faster now.
Please check out the installation instructions:
You should have no problem to build the modeler for Activiti. We also thought it is a good idea to polish the Activiti modeler skin (see the attached screenshot).
The changes on the BPMN 2.0 serialization will follow shortly.