Gamespot has leaked the Final Fantasy XV release date in a video ahead of the Uncovered: Final Fantasy XV event.  It seems that it will be launching on September 30th, 2016.  Also, with a demo supposably releasing today that can be seen in the video at the bottom of the post.

    Final-Fantasy-XV-RD

    And a demo is launching today.
    Edit: Video is now private, backup thanks to salromano: