The film will be based on Jeff Guinn's non-fiction book Go Down Together: The True, Untold Story of Bonnie and Clyde, which delves into the facts behind the myth of Bonnie Parker and Clyde Barrow.
Hoult will shortly be seen reprising his role as Beast/Hank McCoy in X-Men: Days of Future Past. Clarke is currently filming the role of Sarah Conner in Terminator: Genesis.
Faye Dunaway and Warren Beatty famously portrayed the pair in 1967's Bonnie and Clyde. Holliday Grainger and Emile Hirsch starred in last year's television miniseries.
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