https://www.gamespot.com/articles/fortnites-new-playground-mode-allows-respawns-and-/1100-6459186/

Fortnite continues to evolve, and its developers are giving a sneak peek into some big new additions to the game coming in the near future on PS4, Xbox One, PC, and iOS. Following a big new content update that introduced jetpacks to the game, Epic Games has released its fifth State of Development as a window into future content, with tweaks to controllers, quality-of-life improvements, more Limited-Time Modes, and a new Playground mode that allows respawns on the way.

Playground is a Limited Time Mode that will load you into the Battle Royale map with an extended period of time to roam around the map. There will be increased resources, all treasure chests and ammo crates will be present, and friendly fire will be enabled, but with immediate respawns. We've also been promised there will be "Lloads of Llamas" on the way too.