It's a major film that had not been released yet. If we end up with a huge number of things listed from trailers that are often not well seen or easy to identify we end up with duplicates, things that don't appear in the actual movie and various other issues that make it more difficult for whoever eventually adds the movie to the point that it deters them from completing the movie. Also, with it being a major movie that people outside of the site regulars will be interested in it reflects poorly on the site if it becomes a mess.