Staples is said to have replaced 'Iron Man 3' writer Drew Pearce as the scriptwriter of the action film, said The Hollywood Reporter.
His writing credits include video games 'Need for Speed: Rivals' and 'Call of Duty: Modern Warfare 3'. He is also attached to write Ben Affleck starrer 'Blood & Treasure', Fox's 'Myth', and Jeremy Renner's starring vehicle 'King of Heists'.
The upcoming movie is set to be released in the United States on December 25, 2015.
Renner and Simon Pegg are expected to reprise their roles. Christopher McQuarrie serves behind the lens, and Jessica Chastain has reportedly been offered to play the "right hand woman" to Tom Cruise's Hunt.