I have a embedded a block to manipulate related objects in the frontend siteaccess using the following code:

{foreach $object.related_contentobject_array as $child}
  {content_view_gui content_object  = $child
                    view            = first_set($view, 'edit-embed')
                    parent_id       = $object.id
                    parent_version  = $edit_version
                    parent_language = $edit_language|not|choose(concat($edit_language,"/"),'')}
{/foreach}

<button name="UploadFileRelationButton">Add new {$typetext}</button>
<button name="BrowseObjectButton">Link existing {$typetext}</button>
<button name="DeleteRelationButton">Remove {$typetext}(s)</button>

This works correct when creating new objects (ie when a relation is added or removed it is updated in the //draft version//) this works as expected.
On the other hand if I edit a existing object the changes are not displayed until you actually publish.

The cause of this is //eZContentObject::relatedObjects// uses CurrentVersion which defaults to the current published version and not to the draft version.

To overcome this issue I have created a patch that allows the //content/related_objects// fetch function to take 1 more parameter: version.

Patch is located at github: https://github.com/ezsystems/ezpublish/pull/395