Honestly, I'm guessing if Universal Monsters is coming back; they announce it at Monsterpalooza.
It was one of the highest rated mazes in event history (if I'm not mistaken), and it would make sense if that's the focus of the panel. Albeit, similar to when they focused on AHS in 2017 (a good chunk of that panel, was on AHS, with just a slight bit on Krampus).
I'm guessing ST before Monsterpalooza for both Hollywood and Orlando, and then Monsterpalooza getting Universal Monsters: Book Two.