I want to publicly thank @nuclearsandwich and @Crola1702 for their continuing effort and persistence to finalize this migration!
This was planned more than a year ago: IMPORTANT: Final ROS & Gazebo Answers Migration Schedule - #16 by tfoote
But there were a lot of small things to be resolved along the way.
Please help out the community by keeping an eye out for questions you can help with on Robotics Stack Exchange