Disney Inifinity has released their iPad app, and are making it free until October 5th. The Toy Box App lets you create toybox levels on your iPad, and save and upload them to your console. It also allows you to import the characters that you've purchased by entering the code that was included with your figurine.
Once you sign in to your Disney Infinity account, everything you've unlocked in the console game syncs automatically to the iPad version. World creation on the iPad seems like a much more intuitive hands-on experience over doing it with the controller on the console.