Please find the release notes here:
https://www.reddit.com/r/OBSNinja/comments/irz5be/obsninja_version_12_released_change_log_here/
tl;dr; In this release I mainly tried to improve the connection reliability of the group rooms, added features to the Director's control room, added new URL parameters, and improved system scalability.
This version has seen about 2 days of production-level testing; some bugs may still exist. Please report them if you find any.
This is a mirrored-copy of what is currently live on OBS.Ninja -- editing index.html can of course customize things further to meet your needs.