Monstrous Menagerie II: Hordes & Heroes has a launch date! Mark your calendars for November 12th, 2024. 300+ more monsters for your D&D 2024, or Level Up: Advanced 5th Edition games, plus new horde rules and rules for heroic monsters who level up alongside you--whether they be allies, companions, or foes! Click here to follow on Kickstarter!
I can also say that they pre-date MV:ttNV, Gloomwroth, and Guardmore Abbey (as they started adding the name on the bloodied side - frakin' bonehead move IMO).