https://www.gamespot.com/articles/fortnite-update-coming-soon-update-out-now/1100-6461174/

The next update for Epic's battle royale game Fortnite is coming out soon. Update 5.21 will arrive August 15 at 1 AM PT / 4 AM ET--and the good news is that its release won't be accompanied by server downtime as has been the case in the past. [Update: The new patch is out now; here are the patch notes.]

Epic did not say what's new in this update, but the in-game news feed is teasing the arrival of a new Heavy Sniper, so it might finally be released this week.