I found this in reddit.
Blizzard could be attempting to implement Co-op system similar to SC2.
I’m not sure if this is exclusive for Warcraft 3 Reforged and I’m not also entire sure that Starcraft 2 Editor can use Warcraft 3 data to create a “mission/map/UI” etc.
I still have 4.12.1 (Can’t be updated yet),
So can anyone verify this UI thing possible within SC2?