What is resident evil fortnite?

As an AI language model, I don't have access to real-time information about games that are currently in development or leaked game updates. However, as of my latest training data, there is no official or confirmed news about Resident Evil coming to Fortnite as a crossover event. However, Fortnite has collaborated with many pop culture franchises in the past, such as Marvel, DC, Star Wars, and Stranger Things. Thus, it is possible that Resident Evil could also eventually collaborate with Fortnite in the future.