Tetsuya Nomura has been replaced by Hajime Tabata, director of Final Fantasy Type-0 (HD), as director of Final Fantasy XV. The reason for this switch is that Tetsuya Nomura has been working on the original concept for the story and universe and he has also created the characters. Since the development of Final Fantasy XV has come so far, Nomura’s work is pretty much all in place. He has been moved on to work on other projects and make games that only he could do, like Kingdom Hearts III.
The special playable demo that will be available for download with the launch of Final Fantasy Type-0 HD is called Final Fantasy XV - Episode Duscae and takes place near the beginning of the game. Only certain elements will be different from the final game, since this is a demo and Square Enix wants you to get hands on with a unique first-play experience that will be able to give you a better feeling for the game as a whole.
With this announcements Square Enix has also revealed the Tokyo Game Show 2014 of Final Fantasy XV. Enjoy!