This is certainly not a big discrepancy between dates, considering it’s only a two months difference. It does bring certainty to Thor: Love and Thunder filming early next year in Australia, as Natalie Portman said in her interview. As for which date it could be, I would lean towards March more than January.
While The Hollywood Reporter says Hemsworth is due to film in January, Deadline reports that he won’t begin filming until next March.
Not only will a March start month allow for more time for Shang-Chi to finish filming without rushing, but this would also to give Marvel Studios extra time to set up a safe working environment due to the ongoing pandemic. Additionally, they’d want to make extra sure that the expansion of a “larger custom volume” at Fox Studios Australia is finished.