https://www.gamespot.com/articles/new-fortnite-ltms-soaring-50s-and-sniper-shootout-/1100-6461180/

Fortnite's 5.21 update is now available across all platforms, introducing yet another new weapon to the game--the Heavy Sniper--and making a handful of bug fixes to both Battle Royale and Save the World. On top of that, the patch marks the start of two new limited-time modes: Soaring 50s and the returning Sniper Shootout. [Update: Epic announced via Twitter that one of the new LTMs, Sniper Shootout, has been switched from solos to duos.]

Soaring 50s is the latest iteration of the popular 50v50 mode, albeit with an "extra emphasis on mobility." As before, players are divided into two teams of 50. Loot, ammo, and resource levels are the same as in previous versions of the mode, but this time, players will have a greater chance of coming across Launch Pads, Boost Pads, and Impulse Grenades. Players will also be able to redeploy their gliders when falling from more than 10 meters.