The Great Smoky Mountains website has posted an update regarding the installation of vault toilets at the Alum Cave Trailhead and on the Cades Cove Loop Road. The installations will result in a couple of temporary closures next week. Here's the statement from the GSMNP website:
• Cades Cove Loop Road will be closed until noon on Thursday, June 16 to install a vault toilet.
• The north parking area at the Alum Cave Trailhead will be closed on Friday, June 17 to install a vault toilet. The trail will be open, but parking will be very limited.
I'll post more information if any other details become available.