The demo was only available for less than a day on the Japanese XBLA, apparently having been unlocked by mistake. It seems to be the same demo that was shown at PAX East 2012. The demo appears to have been designed to accompany the full game which was probably more or less ready for release. At the time of writing the reasons for the delay are still unclear, and it remains to be seen how much the game will have changed since this demo, and whether or not it will even be released on the current generation of consoles.