Leave a Legacy is currently being removed from its current location as part of the ongoing re-imagining of Epcot, including a refreshed entrance. This new entrance will include a new location for Leave a Legacy, expected to be revealed next year. Guests will be able to view enhanced photos along with a new locating system for those looking for specific tiles.
For reference, here’s what the remaining Leave A Legacy monoliths looked like this past weekend:
Here’s a video walkthrough of the currently walled monoliths all along the left side entrance of the park: