Both The Force Awakens and Rogue One: A Star Wars Story went relatively unopposed in their December releases, and we can reasonably assume that the currently-untitled Episode VIII will do the same when it debuts on December 15 of this year.
Although it’s an unexpected change, the possibility of a December premiere actually seems logical when we consider Disney and Lucasfilm’s recent history of winter releases.
Although summer has typically become known as the blockbuster season, the Star Wars franchise has carved out a good niche for itself on the other side of the year.