Update: The patch notes 9.30 have been released by Epic, here you can find them.
Epic Games has announced the next Fortnite update, Fortnite Update 9.30 will be released tomorrow, 6/18/2019.
The Fortnite servers will be offline around 4 AM ET (0800UTC), as long as the maintenance will continue, is not known.
We assume that also Fortnite Client Patch 2.26 will be released, which you then have to download. Officially confirmed this is not yet. In any case, we will provide you with the official patch notes as soon as Epic releases them.
What Does Fortnite Update 9.30 Do?
What the Fortnite Patch on 17.06. is currently not known, but today a new trailer was released, in which you get to see, among other things, a new weapon - The Flare Gun. It's close to the trailer showing the new content for update 9.30.