The original Final Fantasy XIV, released in September 2010, was a commercial and critical failure. In response, a new team developed a new game under the title A Realm Reborn.
Final Fantasy XIV (ファイナルファンタジーXIV, Fainaru Fantajī Fōtīn), also known as Final Fantasy XIV Online, is the fourteenth installment in the Final Fantasy series, due for release on September 30, 2010 for Microsoft Windows and March 2011 for PlayStation 3. The game is a massively multiplayer online role-playing game and is developed and published by Square Enix. The game takes place in a land called Hydaelyn, mainly in a region named Eorzea, which will have a contemporaneously aesthetic blend of science fiction and classic fantasy elements. The game will be released in Japanese, English, French, and German.
The battle and job systems will be different from the one previously used in Final Fantasy XI, which utilized experience points and level-based progression. Final Fantasy XIV is being designed to utilize a skill-based progression system similar to that of Final Fantasy II. Character races will resemble and allow players to create avatars similar to ones in Final Fantasy XI. Group play has been de-emphasized, and now solo and group play have been balanced. Weapon use will alter "character development".
The North American official website was updated October 7, 2009 and explains about the Job System, also known as The Armoury System. By wielding different weapons and even crafting tools, players will be able to take on the role of their choosing such as Gladiator or Thaumaturge. In general, the different roles are divided into four disciplines: Disciples of War (masters of combat arms), Disciples of Magic, Disciples of the Land (gatherers of material resources and students of the natural order), and Disciples of the Hand (crafters who invest their creative ingenuity in synthesis and industry). The crafting system will be a part of the Armory System; when a player decides to wield a Blacksmith hammer, their appearance will change and they will become a blacksmith. The same goes for harvesting tools; a player will be able to equip them and their appearance will change. They will then take on the role of a resource gatherer.
Source: Wikipedia, "Final fantasy xiv", available under the CC-BY-SA License.