These days it's not uncommon for big game releases to be accompanied by their own iOS app - a Companion App if you will. In fact, it seems more uncommon for a AAA game to come out and not have some sort of iOS presence.
And goodness do they ever have an iOS presence. It's the very reason AppSpy has taken the time to put together a list of many of the AAA companion apps you'll find on the App Store. Grand Theft Auto V, Shadow of Mordor, Elite: Dangerous, Far Cry 4, and Dragon Age: Inquisition are only a few examples of what they've covered.
You can find the complete list right here.