Ubisoft opted for an alternate history premise for the Assassin's Creed 3's Tyranny of King Washington DLC so as not to fracture the player base.
Lead designer Steve Masters told OXM: "For me, the DLC has always been a touchy thing for putting important story moments into. Ultimately it fractures the audience and makes it really difficult for people to keep up with what is the canon of the series.
"For us, we want to have a little fun with it, and have a less serious experience, a less earnest experience, and setting it in an alternate history environment gives us room and freedom to play around with things in a more whimsical manner.
"We think people are going to enjoy it, have fun with it - we've just got to remember it's not part of the canon, it's just there as something for players to enjoy."
Outlining Assassin's Creed 3 DLC plans last month, Ubisoft said the post-release content will feature "an all-new single-player campaign" which will be made "available as a continual episodic story through three DLCs that will let players experience an alternate history of the American Revolution".
The publisher has confirmed an Assassin's Creed 3 Season Pass, which will provide access to a total of five DLC releases. Content will also include further single-player missions, plus new maps and characters for the game's multiplayer component.
The game launches next week, with the Assassin's Creed 3 release date set for October 30 on PS3 and Xbox 360, with a PC release to follow on November 23. A Wii U version will also be available when the console launches next month.