I've received a possibly final update for our icon set (version 5, 2013-05-29).

It contains:

• a new icon the "Categories" app and a single "category" (both use the same icon)
• a new icon for single "tag" and for multiple "tags"
• a new icon for a possible "delete search" function in search fields
• six new icons for linking and unlinking, made for the rich text editor

Please generate a new icon set and install them.