The Great Plateau has been added as one of the new stages in Super Smash Bros. Ultimate. When the roof of the tower is destroyed, a platform materializes in its place.
That platform has some text in the Sheikah language on it, which translates to “SMASHBROS”. It’s a nice little Easter egg hidden for the fans!
You can see the stage in action in the video below, with the platform visible at the 15:54 mark.