I don't know what these people do to figure out that these kind of files are hidden somewhere on official anime websites. I guess some people have nothing better to do than to browse through the page source.

The official website for Shangri-La has only posted a 16 second commercial just this Tuesday. I guess after that was posted, someone browsed around to see if there were other videos that they were planning to put up. Thanks to whoever found this file, you can now watch the opening for this anime. The opening song is amazing, but that's no surprise because Macross Frontier's May'n is singing it. The anime will premiere on April 5th, as well as being on Crunchyroll that same day.