“The idea came up a long time ago during production. We wanted to make it a blood relative of Cloverfield,” producer J.J. Abrams told Collider. “The idea was developed over time. We wanted to hold back the title for as long as possible.”
Basically, 10 Cloverfield Lane is a movie once called Valencia, a Bad Robot film that’s long been on Paramount’s release schedule for March 11. That movie is directed by Dan Trachtenberg (Portal: No Escape) and stars John Goodman, Mary Elizabeth Winstead and John Gallagher Jr. They’re all in the trailer.
Though details have long been kept secret about Valencia, the film reportedly tells the story of a girl who wakes up in a basement and is told she can’t go outside because of a chemical attack. The problem is, she doesn’t know if that’s true or not.
Nothing at any stage of this film’s development made it sound like a Cloverfield sequel, so let’s assume it’s not. Why the title 10 Cloverfield Lane? Well if the film largely takes place at a single residence, an address would make sense. And that address could be “Cloverfield” because that’s the name of the exit you’d used to get to Bad Robot in Santa Monica, CA—hence the original movie having that title.