I just updated the roadmap listing the items we are currently working on: https://github.com/ros2/ros2/wiki/Roadmap/_compare/c2534789f4a829d259e52e085b3545e2353bfcb0...f85cd1eac79d54b5f9aee6353753ae8207b28ae9
As progress and resources permit we will hopefully be able to add more items over time.