Square Enix just announced that the disk space requirements for Final Fantasy XIV: A Realm Reborn will change with the addition of patch 3.2 in February.
The PC and Mac clients will increase their footprint from 20 to 30 gigabytes. The PS4 client will now require 50 GB, up from the current 40. The PS3 version will remain relatively small, moving from 12 to 20 gigabytes.
Time to free up some disk space, unless you already have the Heavensward expansion, in which case the requirement (which were already higher) don’t change for you.