A release date, cover art, and special features for The Sprial Staircase Blu-ray and DVD have not yet been revealed, but we'll keep Daily Dead readers updated on this release. In the meantime, you can check out the official announcement from Kino Lorber below, as well as the film's trailer.
From Kino Lorber: "Coming Soon on DVD and Blu-ray!
Oscar Nominee: Best Supporting Actress (Barrymore)
The Spiral Staircase (1946) Starring Dorothy McGuire, George Brent, Ethel Barrymore, Kent Smith, Rhonda Fleming, Elsa Lachester and Sara Allgood - Based on a Novel by Ethel Lina White (The Lady Vanishes) - Shot by Nicholas Musuraca (Out of the Past, Cat People) - Directed by Robert Siodmak (Criss Cross, Cry of the City)"
Synopsis (via Blu-ray.