https://wccftech.com/fortnite-is-getting-the-chaos-physics-engine-with-chapter-2-season-2/

Epic Games announced that Fortnite's Chapter 2 - Season 2 is getting a slight delay and is now expected to hit on Thursday, February 20th.

That's because Patch 11.50 is being given priority, as it will introduce Fortnite to the Unreal Engine's Chaos physics system. At first, the developers are simply looking to 'ensure that Fortnite still feels like Fortnite'.