https://www.pcgamer.com/fortnite-50v50-mode-is-back-in-action/

Just in time for the weekend, Fortnite's 50v50v2 mode is back in action. The mode drops two teams of 50 players on opposite sides of the island with ten minutes to loot, five minutes to fight, and then five more minutes as the storm closes in. 

The return of the mode is a surprise, but what makes it especially unusual is that it will run side-by-side with the Thanos mode that kicked off earlier this week. That mode enables players to don the mighty Infinity Gauntlet in the game, although it confers neither the power nor the durability of Marvel's famous raisin-face. According to our resident Fortnite expert, this is the first time that Epic has run two temporary Fortnite modes simultaneously.