New Game Feature Active WORLD

Hello, a few years ago I had an experience in The Burging Crusade, I don’t know if it was a quest or if it was a private server, but the idea was as follows:
A city in Outland could have its PVE (Alliance/Hoard) population content changed depending on the active player content.
I think it would be an idea for some cities to be able to change depending on the active players.
So each alliance could have bases in interesting areas, including having a siege system to be announced on the map or nearby.
But it would create a greater unity, and the World of Wacraft would become a living WORLD.
It is also a little inspired by the game Helldivers 2, from there this memory came back to me.

Is this a new Burger King themed expansion?