https://www.gamespot.com/articles/fortnite-update-coming-soon-will-fix-bugs/1100-6458221/

Following yesterday's emergency server downtime, Epic is releasing new Fortnite update that will fix bugs for the Battle Royale and Save the World modes. Update v3.5.1 will launch at 4 AM ET on April 13, and the good news is that there will be no downtime at all.

The updates fixes a bug in Battle Royale that could cause the game to crash related to the new Replay system. Additionally, it fixes a bug that allowed players to fire a weapon before the equip animation completed when sprinting. On top of that, you can now bind the Building Edit hotkey to keys other than G, which sounds like a nice little tweak.