All users who have permissions to edit(modify) can also have edit versions. To know whether or whom of the other users have a working version, it is now possible to display another collumn in the Structure list , in which the number of editing versions is specified. If you click on it, you will receive a detailed view.
In this example by clicking on "2", which is in the collumn "edit versions", you receive the following information:
One can easily understand which users have unpublished versions.