Square Enix has released the official notes for the v1.21 Final Fantasy XIV patch. The comprehensive notes give all of the details about changes coming into the game in preparation for this fall's v2.0 release.
The notes give details about Events, Battles, Items, System changes and Bug Fixes. Information is also available about alterations in the Guild Mark Exchange, job-specific actions, gatherable items, NPC selling and buying prices and new items added to the game.
Read all of the details on the Final Fantasy XIV forum.