Unities were added in the update last week. As part of these supergroups, there are several objectives you can accomplish. While some are unique to whatever group you're in, there's a set shared among them all.
These change to the next on the list at 7am PST/9am EST (JP midnight).
(http://s16.photobucket.com/user/Cooper65535/media/SharedUnionObjectives_zpsc78e6a42.png.html)