From Casio: "Additionally, users can import song data (MIDI format) into Chordana Play, link to other electronic keyboards in Casio’s portfolio (including the Key Lighting and Standard keyboards) and connect to both Apple and Android tablets using a standard audio cable." The app will be available for Android as well - nice touch! Tablets only because smartphone screens are too small? Other than that, good idea, but still not for me. I hope Casio will have something in the pipeline for Musikmesse.
EDIT: Come to think of it - if you can't use headphone out with newer Apple devices, I wonder how that will work without headphone plug ... ;-)