From Broadway World:

Production wrapped today [14 December 2018] in ROME on one of the most buzzed about films of the year - the feature adaptation of J.M. Coetzee’s prize-winning novel “Waiting for the Barbarians”, directed by Ciro Guerra, produced by Andrea Iervolino, Monika Bacardi, and starring multiple Academy Award® nominee Johnny Depp (“Pirates of the Caribbean” franchise), Academy Award® winner Mark Rylance (“Bridge of Spies,” “Dunkirk,” “Ready Player One”) and Robert Pattinson (“The Twilight Saga”, “Good Time,” “The Lost City of Z”).
…

Waiting for the Barbarians” centers on the crisis of the conscience of the Magistrate (Rylance) – a loyal servant of the EMPIRE working in a tiny frontier town. A warrant officer for the Empire, Mandel (Pattinson), is sent to replace the Magistrate’s position after the Magistrate has been charged with treason – consorting with the barbarians. Johnny Depp plays the sinister Colonel Joll.

The story is a startling allegory of the war between oppressor and oppressed. Mandel is a character that must choose between what he feels is right and his duty to the EMPIRE in the midst of conflict.

Olga Segura also confirmed on her instagram