Builds 53.1 through 53.3 were for internal testing
On the case landing screen, there is a new tab labeled Wait List. On this tab, you can view the "People I am Waiting On" relevant to the case.
You can now set the System Access for an Investigator (includes Managers, Investigators, Viewers, and Recruiters, to Archived, in which case an archived Investigator no longer appears on this list. Should you need to find an archived investigator, there is now an item under the Search/View menu for that. Note that item is only available to those with Manager system access.