There have been some rumors, and even fan made videos (see below) of a possible Transformers X Fortnite game crossover coming in Chapter 4 Season 3.

Just up on reddit in the r/GamingLeaksAndRumours group, is this image (above) that is said to have come from "The skin on a loading screen:" What is interesting is the Fan video and the Screen shows the Optimus Prime design from Rise Of The Beasts. As easy as it is to fake an image, and even a video, this should be considered just a rumor, or hoax, until the official word comes down from Hasbro or Epic Games.