No entiendo bien a lo que te refieres con el disco de extras, si no lo van a poner aquí en caso de comercializarla en España, o que directamente no va a traer disco de extras, tal cual viene en la carátula. Si te refieres a esto último, es un error en la edición de la carátula. Mensajes más arriba tienes detallado el desglose de los extras y documentales que traerá esta edición.
There are no extras on the 4K disc itself, but the package will include that same Blu-ray (along with a Digital code).
Among the special features on that Blu-ray will be More Loverly Than Ever: The Making of My Fair Lady Then & Now, 1963 Production Kick-Off Dinner, Los Angeles Premiere 10/28/1964, British Premiere, George Cukor Directs Baroness Bina Rothschild, Rex Harrison Radio Interview, 5 Production Tests (including Lighting, Wilfred Hyde White Make-up, Rain/Set, Covent Garden Lighting Test, and Alt. Higgins/Pickering Screen Test), 2 Alternate Audrey Hepburn Vocals (Show Me and Wouldn’t It Be Loverly?), galleries, 2 Comments on a Lady featurettes (featuring Andrew Lloyd Webber and Martin Scorsese), 3 additional featurettes (Story of a Lady, Design for a Lady, and The Fairest Fair Lady), multiple trailers, Rex Harrison BFI Honor, Rex Harrison Golden Globe Acceptance Speech, and Academy Awards Ceremony Highlights 4/5/65."