If everything goes as planned, hopefully by April 2016, you will be able to make your additional FastPass+ reservations from your phone, on your My Disney Experience App. With this new function it will eliminate the need to find a kiosk to make your addition FastPass+ selection, after you have used your 3 initial choices.
StoryMaker, which is a interactive component of My Magic+ is also set to debut soon. Story Maker is already testing in some areas, it allows attractions to interact with you, using your information from your My Magic+ profile. What does this mean? A good example would be "It's a Small World" goodbye sequence may know exactly where you are from, or when you meet Mickey Mouse, he may know your name.
Disney hasn't announced the availability of the new feature, as of now we are treating it as speculation, but hoping it comes to realization soon.