Autoware API
ROS interface (nodes, topics, message types, etc.)
Data structure and format
These are all essentially the same thing, and yes, they are in part covered by this working group, but also in part by other working groups.
Many others upcoming, such as safety and security
I think it is likely we will have additional working groups on those topics once we get enough activity and expertise in those areas, but for now we intend to cover them in this working group and rely on the existing ROS 2 working groups.
The minutes for the Autoware Working Group meeting #20190904 have been posted to the wiki:
Unfortunately attendence at the meeting was very poor. I think that the TSC will likely have to take some actions to increase participation in the Autoware WG. Currently we have a lot of tasks to do and virtually no humanpower available to do them.