A few more details: there was rockfall noted in the Balconies Cave a few days ago, and a large boulder (about 5 feet wide and tall) became dislodged and fell from near the top of the rock stairs and into the main room on the northeast side of the cave. (Basically the boulder is now sitting in the main room on the northeast side of the cave where it starts to get dark and requires a flashlight.) The boulder isn't obstructing the trail, but there are a few other boulders that are directly above the trail (where it is tight along the rock steps) that are loose and could potentially become dislodged and hit hikers.
Staff from the Trails crew and Resources division are going to take this information to the management team before formulating a plan, but I would guess that loose rock will be dislodged, and then the area will be reassessed for safety before making a decision about reopening Balconies Cave.