Because Grant Morrison Could Make Watching Paint Dry Great: First (sort-of) Teaser for Dinosaurs vs. Aliens
Well, there are two interpretations of this film as far as I see it. The first is that given the explosion of comic book movies and Morrison's insistence that The Matrix plagiarized The Invisibles, is simply that Morrison decided to dig up the most abysmally idiotic story he could possibly set to comic book form in order to make a movie out of it to prove a point. That's meta enough that Andy Kaufman wouldn't get the joke.
The second option, and the one that I'm more in favor of, is that Morrison has a fantastic idea for a story that will blow your mind away with such force that you forget that you're watching a movie called Dinosaurs vs. Aliens.
The plan is for Morrison to produce motion-comics that will form both a basis for a film trilogy, and provide additional bridging content. Here's the sort of kind of passing for a trailer that they've put up:
There are several more clips of interviews with Morrison and Barry Sonnenfeld over on Blastr.