Most of the icons within Versions will display a text label when you point at them for a moment.
Repository and working copy status are shown next to the bookmarks, icons are in the browse list.
The numbers in the small badge next to the working copy bookmark show how many items have changes. The number next to the upward pointing arrow indicates local changes in your working copy, while the number next to the arrow pointing down indicates remote changes in the repository. Within the file listing, folders that contain changes show a folder icon in the status columns.
Added: File has been added to the working copy, but not committed to the repository.
Deleted: File has been deleted from the working copy, but not committed to the repository. It will be removed from the file listing once the change is committed.
Ignored: File has been explicitly marked as ignored in the working copy, or is ignored due to global-ignore setting in subversion config file.
Missing: File has been removed from the working copy outside of svn (e.g. deleted in the Finder).
Modified: File in the working copy has changes that have not been committed to the repository.
Unversioned: File is in the working copy directory, but has not been added to version control.