Per Variety, "Warner Bros. had always planned on making a third film. However, Downey's busy schedule as Iron Man prevented any new filming for the series", which I don't really buy. Besides doing well with Rocketman, he famously took over for Bryan Singer after he was sacked from Bohemian Rhapsody.
Narcos co-creator Chris Brancato is credited as screenwriter with Joel Silver, Susan Downey and Lionel Wigram returning as producers.
Chris Brancato is now working on the script for the film, which is set to open on December 21, 2021, which will be slightly over ten years since Sherlock Holmes: A Game of Shadows opened.
Fletcher also scored a BAFTA nomination for his 2011 directorial debut "Wild Bill" and directed the 2013 film adaptation of the Scottish stage musical "Sunshine on Leith". He is repped by CAA.