Unfortunately, we had to rethink our previous plan. Although we'll try allocate resources in the future for this matter, there's a relevant amount of work we'll need to do to publish/support/maintain another open source autopilot.
While we look forward for some of the work that's happening within the PX4 community (e.g.: DDS integration at the core of the autopilot), we currently have decided not to put time into a release right now.
I'm sorry for the inconvenience.