Source :
http://www.ffxiv-eorzea.com/en/news/...apan-expo-2014
Naoki Yoshida was at French Japan Expo early July and gave several interviews.
Here is the one of the Secrets of Eorzea website :
2.3 / 2.4 content:
Secrets of Eorzea : Many players were very disappointed to see the name “Rogue” and not “Thief” in the E3 announcement. Respecting the lore of the game was understood but is it really the end of our hopes to see the “Thief” one day in FFXIV: ARR? Maybe, like the black mage who had a bad reputation in the history of FFXIV, the Thief might become the second job of the Rogue class?
Naoki Yoshida : It was a really, really tough decision for us as well because we are long time Final Fantasy fans. There was a heated debate internally as well to make this decision. But Final Fantasy is full of classic fans like myself, but we need to think about those new to the series as well, so it needs to make sense. In Final Fantasy XIV, every class has a guild, and just because we want to have that traditional role, we want it to make sense with the in-game lore. Especially when we want the game to run for ten years or longer, we need to make sure the relationship between the classes and jobs make sense.
We didn’t want to break the lore by naming classes based on our personal feelings, we wanted it to make sense with the story. So if you see Rogue in game, just in your mind, replace it with Thief. The class and the job and the way it works is really close to Thief, so just think of it as that. Thief won’t be coming as a name. In the story, it will be explained that these Rogues were at one time called Thieves. So it is definitely clear that Rogue equals Thief in the game.