According to The Hollywood Reporter Jeremy Renner‘s Hawkeye will be part of the cast of Captain America: Civil War. The following quote comes from the THR article about him joining the cast of Story of Your Life:
He will shoot Captain America: Civil War this spring, then segue to Story of Your Life in mid-June, working with Villeneuve, considered one of the hottest directors in town and who just booked the sequel to Blade Runner.
The cast of Civil War is shaping up to be just as action packed as Avengers: Age of Ultron with Robert Downey Jr as Iron Man, Scarlet Johanson as Black Widow, Chadwick Boseman as Black Panther, Anthony Mackie as Falcon, Daniel Brühl as an unknown character (rumored to be Baron Zemo), and of course Chris Evans as Captain America. Plus there is the obvious speculation that Spider-Man will appear and Sebastian Stan‘s Winter Soldier seems like a shoe-in.
So I guess that pretty much leaves Rhodey to die in AoU. Poor War Machine.