Milestone 14 was completed on 2020-09-07. It adds support for the mid-year 2020 ROS distro releases, including ROS 2 rolling, with dunfell and gatesgarth, and for the release of webOS OSE v2.6.0 . Also, a few minor changes were added for thud, warrior, and zeus.
A new revision 21 of the OpenEmbedded Build Instructions updated for this has been published. Its change log is here. A “rich diff” of the changes made since the previous revision is here.