So, timeline:
May 2012 -
Script "The Cellar" written and shopped around
April 2014 -
Paramount's Insurge Green-Lights "Valencia" (renamed from "The Cellar" script) with Bad Robot to Produce and Director Dan Trachtenberg is
Brought On to Direct
April 2014 - Director Posts
Picture of Script on Instagram
July 2014 - John Goodman
Rumored to Star
August 2014 - Mary Winstead
Joins "The Cellar"/"Valencia" as Michelle
September 2014 - John Gallagher Jr.
Joins "Valencia"
October 2014 - Filming for "Valencia"
Begins "...has been going by the codename Valencia since Bad Robot became involved. No word on what the actual title of the movie will be."
October 2014/November 2014 - Director Posts
Various Set Images on Instagram
December 2014 -
Filming Wraps for "Valencia"
February 2015 - "The Cellar"/"Valencia"
in Post-Production, Paramount Extends Contract with Bad Robot
March 2015 - Insurge (And Sole Project "The Cellar"/"Valencia")
Absorbed Into Paramount
March 2015 -
Mary Winstead: "Its one of those Bad Robot, cant say anything about the script type of projects... I was at Bad Robot the other day, and they showed me the trailer for it, which looks really cool. Im excited."
July 2015 -
Director Posts "Movie Magic" Shot on Twitter (Potentially Unrelated)
November 2015 -
Test Screening for "Valencia"
January 2016 -
First Trailer Revealed for the Newly Renamed "10 Cloverfield Lane"; Abrahms claims it as a
"blood relative of Cloverfield"