One thing I always wonder when I see stuff like this: is it because development is actually stalled, or is the project just finished? At some point, it can be useful for things to stop changing except to the extent that it is require to prevent bit rot.
FWIW, there's lots of stuff to be done in nREPL proper as well. Anyone interested should definitely ping me. I'll hopefully get the outstanding issues into the new JIRA in the next couple of weeks, along with a migration of the various design notes that are scattered about.