It looks like Olivia Munn (The Predator) is replacing Zoe Saldana in the action thriller Hummingbird. Deadline Hollywood reports that the substitution came after Saldana experienced scheduling conflicts due to her commitments on the Avatar sequels.
Hummingbird tells the story of a female black-ops assassin (Munn) whose latest mark forces her to confront her true identity. It's directed by Marcus Kryler and Fredrik Akerström from a Black List script by John McClain.
Munn is known for her roles as Psylocke in X-Men: Dark Phoenix, X-Men: Apocalypse and her role in the HBO drama Newsroom. Munn is playing Casey Bracket in The Predator, which comes out on August 3rd. She'll also be seen in Ocean's Eight, which comes out on June 22nd.