Jeremy Renner has mentioned in passing before that he might appear in Captain America Civil War. Civil War will feature Chris Evans as Captain America, Robert Downey Jr. as Iron Man, Mackie as The Falcon, Scarlett Johansson as Black Widow, Chadwick Boseman in his MCU debut as Black Panther, Daniel Bruhl in a mystery role, Frank Grillo as Crossbones, and the brand-new Spider-Man.
The Hollywood Reporter has officially brought word that Renner will be returning to the Captain America franchise as Cliff Barden, Hawkeye. The character was not involved in original Civil War storyline as per its source material, however he did play a pivotal roll with regards to Tony Stark’s position after the fact.
Captain America: Civil War is set for release on May 6, 2016.