It was previously reported that Avengers 4 may show Black Widow battling criminals in Japan, so perhaps Clint Barton will assist his old S.H.I.E.L.D. partner as Ronin.
Clint also isn’t the only one who’s rumored to be changing superhero identities in the MCU, as Steve Rogers will reportedly appear as Nomad in Avengers: Infinity War after abandoning the Captain America mantle at the end of Captain America: Civil War.
Clint Barton was the second person in the Marvel Comics universe to become Ronin, inheriting the name from Maya Lopez, better known as Echo.
After being resurrected from the dead, Clint fought as Ronin for the New Avengers team until the conclusion of the Dark Reign and Siege events, by which point he returned to being Hawkeye and shared that identity with Kate Bishop.