The Digital Spy report about the date change suggests that only the UK release date for Aquaman has been moved up, meaning that the film will still debut in American theaters on December 21.
For now, however, it’s just the UK release that has shifted for Aquaman.
That would not necessarily be surprising, as the Marvel Cinematic Universe recently surprised many of us by bumping the release of Avengers: Infinity War up to April 27 from its initial May 4 release date.
That said, on the heels of this announcement, it remains entirely possible that the folks at DC will move up the domestic release date as well.