The War of Emperium Castles should have been rotated around this time, but the GM team has chosen to wait until June for it, so that better scheduled rotations can be done each June and December (Months 6 and 12 respectively).
Regional castles are swapped depending on which region has been used the least at the time of rotation. However, according to Pandora's WoE Castle files and information, Geffen is still the least used in the past several years. Due to this, the regions open for WoE will remain the same: Prontera, Geffen and Aldebaran. The castles will be changed to another of the same region, and Payon's region will be opened on the next rotation after June's.