Details of James Cameron's long-promised sequels to the 2009 blockbuster Avatar are only known in the broadest of strokes, but more than two years away from the release of the first of the four films, we may have learned something significant: their titles.

BBC News reports it has viewed "documentation" about the franchise that references four projects, named Avatar: The Way of Water, Avatar: The Seed Bearer, Avatar: The Tulkun Rider and Avatar: The Quest for Eywa. The outlet then bolsters that information with a previous statement made by Cameron that "there's a tremendous amount of water work across Avatar 2 and 3."

RELATED: Avatar Sequels Have Changed Their Font -- Thanks to SNL & Ryan Gosling

Add to that the Eywa in the title of the fourth project appears to be a reference to the deity worshiped by the Na'vi people of Pandora, and there's a pretty good case to be made for these being the actual film titles.

Production on the four sequels began in September 2017, with franchise star Zoe Saldana completing her part over the summer. Given the immense amount of CG work required, post-production will no doubt continue for years, until shortly before the release of each film.

RELATED: Return to James Cameron's Avatar in New Dark Horse Comic

Avatar remains the highest-grossing film of all time, earning $2.788 billion worldwide.

Arriving Dec. 18, 2020, Avatar 2 will see the return of stars Sam Worthington, Zoe Saldana, Sigourney Weaver, Stephen Lang, Giovanni Ribisi and Joel David Moore, and introduce Kate Winslet, Oona Chaplin and David Thewlis to the franchise.. Avatar 3 will follow on Dec. 17, 2021, with Avatar 4 and 5 expected in 2024 and 2025, if the first two sequels are financially successful.