https://www.pcgamer.com/new-campaign-biome-and-enemy-types-coming-soon-to-fortnites-save-the-world-mode/

Fortnite's co-operative Save the World mode always gets less attention than its battle royale brother, but Epic is promising big changes over the coming months. Most notably, the new Canny Valley campaign, alongside a new biome, will arrive in the "near future"—they'll be here "shortly after v5.0", which is due next month.

The campaign will arrive act-by-act, and will "take you through the Arid parts of the Fortnite world, with many new and unique places to explore.