https://www.pcgamer.com/fortnite-adds-grappler-high-stakes-event-getaway-ltm-in-update-v540/

Fortnite's 'High Stakes' event was detailed this week, wherein its Getaway LTM has squads fighting over four safes dropped at random across the map. Crack the vaults, steal the jewels and secure the loot to win. It's live now, as part of the battle royale's update v5.40—as is its new Grappler item. 

Grapplers are of Epic rarity and can be found as floor loot or inside vending machines, treasure chests, supply drops and supply llamas. Each packs 15 charges and "attaches to anything you hit for quick traversal." I linked to this tweet the other day, but here's another look at the device in motion: