Joaquin Phoenix and Emma Stone are set to star.
Allen is expected to write, produce and direct, as he has with so many of his other projects. Letty Aronson and Stephen Tenenbaum will also produce.
Plot details are unknown at this time. The pic is currently filming in Rhode Island.
Posey is repped by CAA and Untitled. Blackley is repped by WME, United Agents and Luber Roklin Entertainment.