Square Enix wanted to make sure their newest Kingdom Hearts game had a web presence for an upcoming press release they had scheduled. The teaser site is just meant to give people a top level synopsis and a few images to get them excited.
It was interesting working on a project that involved Disney because of how disciplined their brand is. Even thought he timeline was only three days to build this we still managed to have time to do some back and forth over what could and could not be animated involving the Disney characters. Essentially, you can not animate them.