Bugzilla:Roadmap
From MozillaWiki
Frontend (UX) Roadmap: https://github.com/bugzilla/harmony/wiki/Bugzilla-6-UX-Roadmap
Backend (Perl) Roadmap: https://github.com/bugzilla/harmony/wiki/Bugzilla-6-Backend-Roadmap
What's still blocking the Bugzilla 6 release: https://github.com/bugzilla/harmony/blob/main/RELEASE_BLOCKERS.md