If you talking about app for smart phones then yoshi-p said he want to release one for ffxiv.arr but it may be delay. He want one that you can buy/sell item and look up information on price and i think he also want for you to see what people talking in your freecompany/linkshell maybe talk not sure about talking part interviews are never very clear on that one.

He also want a app for chocobo one that you can take your baby egg from the game to your cell phone take care of him while you away from ps3/computer then port him back to the game but not sure if this one would happen,.