Starring George Clooney, Jonah Hill, Frances McDormand, Tilda Swinton, Josh Brolin, Ralph Fiennes, Scarlett Johansen and Channing Tatum, the film will include a sendup of the same sorts of classic Hollywood musicals parodied in Dames at Sea.
Tatum, star of the film "Magic Mike," plays a tap-dancing sailor.
The film is written, directed and produced by the Coen brothers.
The plot involves a mysterious group calling itself The Future, which kidnaps the star (Clooney) of a big Golden Age Hollywood historical epic in mid-production, potentially costing the studio a fortune.
Here is the first trailer from "Hail, Caesar!":