The Discovery Search Group meets every 2-3 weeks. Meeting minutes are available to view here.
The Search API project is working on a strategy to provide a release to replace the previous Matchmaker API and adding this functionality to other collaborating resources.
The project team is developping a spin-off project to facilitate a more limited but immediate use case of Case Discovery with a faster v1.0 release. Primary drivers include the Matchmaker Exchange API (MME) group.
@Relequestual 2019-06-13: more ...