Fortnite is down today, February 28, because of Epic Games Battle Royale's outage, but be assured, Fortnite will be back online when it is needed.
Fornite is offline until 09:00 in the morning Italian time. Developers must perform the usual maintenance tasks before the publication of the new one update 23.50 available today. Shortly before 09:00 matchmaking will be deactivated, but whoever is playing will be able to terminate the current game.
Fortnite should be back online between 11:00 and 12:00 in the morning, Italian time, as suggested by the 23.50 update. These are just rumors, and there are no confirmations from Epic Games.
Only then will we be able to see all of the improvements and what's new since the last update, and will be able to determine whether or not there will be crossover events in the next few weeks.