Ok, so there hasn't been a lot of information about the mobile application being released with the game.
I am worried that the game will lack the communication that large scale MMOs provide, but I also see this as a wonderful opportunity to port the communication to a mobile device. I do mobile dev for iOS and Android and see it being completely within reason that there could be regional and city chat rooms tied to your character location that show up on you "second screen" of a mobile app. It would provide the text chat an MMO game needs to build a lasting community.
If this is a feature that has been debunked or confirmed that I haven't seen, someone let me know.
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As long as there is a mobile app for Windows Phone I will be happy. Windows Phone is the ONLY phone I will ever buy. Other platforms such a pain to use.