(photo from https://sites.disney.com/waltdisneyimagineering/our-process/)
That image on the screen shows a very Dia De Los Muertos style skull. Could this be for a Coco ride? Is this the black box ride? What do you guys think of it?
Here's a photo from Coco with the same skull.
Another photo from the Marigold Grand Central Station that seems to closely match what is on the screen.