Fortnite could launch on Apple TV at one point in the future, according to a new discovery by the @StormLeaks Twitter account late yesterday. As reported by esports and gaming website Dexerto, @StormLeaks found a single line within Fortnite's code that references "tvOS," suggesting that Epic Games may be planning to launch the popular game on Apple's fourth- and fifth-generation set-top boxes down the line.
Still, this is just a single mention of tvOS in Fortnite's code and shouldn't be taken as a guarantee that the game will be available to play on Apple TV soon. If it does, the game would likely require a compatible wireless gaming controller, two of which Apple sells for $49.95 on its website.
As it stands, Fortnite is currently available on iOS, macOS, Android, PC, Xbox One, PS4, and Nintendo Switch. Fortnite initially launched as a beta on iOS in March and then expanded wide in April. The smartphone apps are focused entirely on Fortnite's PvP Battle Royale mode, but the console and desktop versions of the game also include a PvE mode called Save the World.
Fortnite Battle Royale on iOS is free-to-play (like it is on all platforms), but due to in-game content purchases the app in June reached $100 million in revenue 90 days after launch. Fortnite initially launched wide in summer 2017 on consoles, macOS, and PC, focusing only on the Save the World mode, with Battle Royale releasing a few months later in September 2017.
Update: According to Epic Games, there are no plans to bring Fortnite to the Apple TV. From Epic's Senior PR Manager: "Epic isn’t planning to bring Fortnite to Apple TV. References to tvOS in the Fortnite files are the result of general Unreal Engine support for the Apple TV platform."