A brand new official iOS pony app has been released. It's primary function is to act as an interactive storybook that you ultimately modify to your liking. There are also a whole bunch of mini-games and activities buried in the mix. At just 99cents, you might as well pick it up. Hell that's how much an official Twilight Sparkle WALLPAPER could cost!
Cereal will be releasing a video review of the entire program either later today or tomorrow morning. Keep an eye out for that!