Seth Grahame-Smith has been working on the script for Paramount’s Fantastic Four reboot, according to Hollywood Reporter.  Grahame-Smith is the author of Abraham Lincoln: Vampire Hunter and Pride and Prejudice and Zombies, and the screenwriter of Dark Shadows and Abraham Lincoln: Vampire Hunter.  
Matthew Vaughn recently came on as producer (see "'Kick-Ass' Helmer to Produce 'FF' Reboot"); Josh Trank is directing (see "Fox Pushes 'Fantastic Four' Reboot").