Well it seems developer Scott Cawthon has stayed true to his word in saying Five Nights at Freddy's 4 would be the final game in the series. That is just a technicality however, as it doesn't seem to limit him from other forms of media. Case in point: along with the MMO and the film, Five Nights at Freddy's will also be released in book form, just in time for Christmas. The novel, Five Nights at Freddy's: The Silver Eyes is purportedly canon (with Cawthon himself listed as a co-writer) and staying with tradition, is being released far sooner than expected. The story follows the founder of Fazbear Pizza's daughter, Charlotte, ten years after the child murders in the game took place. She returns to the restaurant and at that point, the outcome is pretty much expected. However, there is potential to reveal or confirm a lot of theories and story lines here. Thus far it seems to at least confirm that recent theories that the story of the original games was all "a dream" are probably not true.
The novel is, not surprisingly, highly anticipated by fans of the series. It is far from the only Five Nights at Freddy's related project being worked on right now though. There is also the film, directed by Gil Kenan, who has taken to researching for the movie by stalking his local Chuck E. Cheese and posting teasers for the animatronics in the film. There is no official release date for the film, with Cawthon and Kenan keeping details tightly under wraps.
And there is also the RPG style game FNAF World which is supposedly a deviation from the original Five Nights at Freddy's series. The cutesy graphics and music seem to imply that FNAF World is not going to be a horror game, and Cawthon has said outright that it is not part of the story. But some of the teaser images leading up to the games announcement might indicate something slightly more terrifying.
FNAF World does not have a release date yet (and thus far is the only game the creator hasn't enthusiastically released months before intended, but has actually delayed). It will be released for PC and smart phones. Five Nights at Freddy's: The Silver Eyes is available now, only on Amazon in paperback for $17.99 (the high price for a physical copy is due to Amazon price restrictions) and digital for $2.99. The book is free for KindleUnlimited users. No date has been decided for whatever will finally come along and put a stop to this madness.