This thread discusses the Content article: E3 Video: Prince Caspian trailer

Looks kind of "cartoony", more like a video game than a movie.

It is a videogame. That trailer came from our E3 Video Game conference coverage, but I can see how, if you happened upon it alone, it would be easy to miss the all the game-related stuff surrounding it. My mistake.

So to clarify: it's a trailer for the video game that's being made based on the movie. Some of the visuals you see in this trailer are no doubt based directly on the designs utilized in the film, but I'm sure these visuals in no way do justice to the live action film.