Five Nights at Freddy's may collaborate with Fortnite during Halloween as part of the annual "Fortnitemares" event. This information is currently a rumor and has not been officially confirmed.
This news comes from leaker SamLeakss, who has provided accurate leaks in the past. However, no details regarding the collaboration's content, release date, or format have been mentioned, and Epic Games has yet to make an official statement.
Fortnite has entered Chapter 7, Season 4: "Override." This season features collaborations with Sonic and friends, Joker from Persona 5, Mega Man, and Crash Bandicoot.
"Fortnitemares" is Fortnite's annual Halloween-themed event. Whether Five Nights at Freddy's will appear in this year's event remains to be seen pending an official announcement.