For weeks there have been rumblings in the film industry - amid tight secrecy - about a big new movie headed for Sydney's Fox Studios.

Could it be Baz Luhrmann's planned Elvis biopic, which reportedly has Tom Hanks in talks to play Colonel Tom Parker? Or George Miller either making a new Mad Max, after an extended legal dispute with Warner Bros, or the love story Three Thousand Years of Longing with Idris Elba and Tilda Swinton?

Comic book character Shang-Chi is set to be the first Asian superhero in the Marvel universe. Credit:Marvel

Or could Australian director Cate Shortland be bringing her Marvel superhero movie Black Widow, starring Scarlett Johansson, to her home city?

One by one, these theories have fallen over.