I don't think there should be a legal problem with this one. Dinosaurs And Aliens is a planned movie from Barry Sonnenfeld and Grant Morrison, who has written the screenplay. But he's also written the comic.
Announced last year, with a Free Comic Book Day comic coming from Liquid Comics next month, I understand that Dynamite will be publishing the full graphic novel in May, drawn by Mukesh Singh.
Just in time for DC to bring back Grant's Batman Incorporated as well. I call that good timing.
Of course if you want Batman, Dinosaurs And Aliens, you should be reading Neal Adams' Batman Odyssey…