My favorite exchange came when Tate asked him why he chose to write a story about vampires:
I didn't set out to write "about" vampires. I viewed them as a means to an end, in this case, creating a circumstance that would have my characters running for their lives virtually all the time. I needed a boogeyman, in other words, and I chose vampires, or something vampire-like because I saw an opportunity to do something with them that I hadn’t really seen: to take magic out of the equation. The virals of The Passage aren't the vampires of literature. In the world of the story, they're the biological source of the legend. They're people with a disease, a viral infection that, from time to time, has emerged into the human population and produced symptoms that have, over centuries, morphed into the vampire myth. It's a condition no more romantic than cancer, or AIDS, or the common cold.
There wasn't any update on the movie version of The Passage, but he did discuss what he plans to do after the trilogy concludes with the release of the third and final book, City of Mirrors, later this year:
I'm finishing the third volume of the Passage trilogy now. It's called The City of Mirrors. Like the first two, it's a long book, and I imagine I'll take a little break once it's done, but I've got three more projects I'm already making notes for. Probably I'll get back to work pretty quickly. You don't want to stand on the pier too long.
It's a very insightful interview and I'm sure you'll learn something new about Cronin. Read the whole thing at Rollins360.