What is happening to Sandboxie?

When can we expect Sophos to finally make good on their promise of open sourcing Sandboxie? I can understand if they want to have some sort of structure for the project in place before doing so, but in the interim, it's not unreasonable to expect them to support and maintain Sandboxie. Unfortunately, they have done neither. They do not provide assistance, and recent updates to Windows 10 have caused Sandboxie to break and these issues have been left unfixed.