Final Fantasy XIV: A Realm Reborn will be undergoing maintenance today. Once it starts, the game will not be playable until maintenance is complete. Square Enix says everything will be brought down at 11pm PDT to 5am PDT. The good news is the maintenance period takes place in the evening hours so many people will be asleep while it’s happening. Once the game comes back online, patch 2.25 should be implemented as well.
Patch 2.25 is said to include changes to the Wolves’ Den (PVP) and a new materia system. The patch won’t contain new quests for Zodiac Weapons. The reasons behind the delay is for Square Enix to receive more feedback on the existing quests, increase the locations for upgrade materials and to give more players time to get an Animus weapon. The new quests are planned to arrive in the 2.28 update in May.
Source [Square Enix]