https://www.gamespot.com/articles/fortnite-update-coming-soon-heres-when/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.

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.