Business Wire:

Amazon Prime members can be the first to experience the epic, action-packed adventure in the stunning undersea world of Atlantis. Aquaman is sure to be at the top of everyone’s wish list this season and Prime members will get exclusive access to an early showing of Warner Bros. Pictures’ and director James Wan’s DC Super Hero feature film. The early showing reserved for Prime members will take place on December 15 - a week before the film is released on December 21, 2018.

This worked really well for Jumanji last year, but I’m not sure if this is for the same type of audience. Jumanji skewed for families, while Aquaman seems to aim older.