One looks kinda like a beehive, and another like a... siege... thingy.

New Campaign Elements are coming to Final Fantasy XI in their big content update. They have a special feature posted which gives you the highlights.

Since the release of the Wings of the Goddess expansion pack, countless adventurers have enjoyed serving their nations in the Campaign theater. Occurring in higher frequency than their Besieged counterparts, Campaign battles offer a more readily available venue, where players may take on more varied and rewarding roles.

As a result, we recognize the need to make adjustments and introduce new content in order to prevent repetitiveness in the gameplay and enemy AI.
Following in that vein, the next version update will herald in a number of alterations and additions to Campaign.

You can see what they've got up their sleeve at the FFXI community site.