A 90-second trailer of an upcoming animated film has given a sneak peek at what promises to be a landmark piece of Chinese cinema.

Door Guardians, a production by Beijing-based Light Chaser Animation, will hit the big screen early next year.

Director and screenwriter Gary Wang was unwilling to reveal too many details of his first feature-length animated film at a news conference last week, except to say the film is about courage and change, and the production will be finished before July.