So far the promised features are inventory management for your retainers, scheduling events, chat, and handling market boards for an exchange of kupo nuts or moogle coins. (No word yet on how you get either of those.) It should provide a nice bit of management functionality if you’re going to be away from the computer, so keep your eyes peeled for more details on what you can do and the supposed premium services that will be offered with the app.
Final Fantasy XIV players that there will be a companion app. It’s been promised for so long, in fact, that it would be easy to have written it off as never actually happening. But it is happening! In fact, it’s happening in late July, with the caveat that it might be delayed a bit as part of the app review process. The important thing is that it’s soon, and you will be able to take a little bit of the game wherever you go.
Source: Official Site