I added new worksets to a Local File and used Synchronize with Central to share the change with others. The Active Workset lists on the ribbon and Status Bar did not update in other user's files after they used Reload Latest or Synchronize with Central. It was necessary to open the Workset dialog and just click OK before the new worksets would appear in either the ribbon or Status Bar Active Workset locations. The Active Workset list doesn't seem interested in being updated until the Workset dialog is opened. The list of Worksets that is offered in the Properties Palette when you select something is updated however.
I see it happening in both 2014/2015, haven't tried it in earlier releases.