The Anthem of the Heart

The Anthem of the Heart, subtitled Beautiful Word Beautiful World, is an upcoming Japanese animated film produced by A-1 Pictures, directed by Tatsuyuki Nagai and written by Mari Okada.  It is being worked on by the staff who had previously worked on the anime series Anohana: The Flower We Saw That Day and its movie adaptation. 

More on the film at http://anthemoftheheart.com.