It seems that the iceberg is going to continue to melt, revealing more of the Castle that has been overtaken by snow.
However, that melting will apparently soon reveal a Dragon Egg - found by data-miners in the files of the v7.10 update. That's right, we might be getting a Dragon in Fortnite Battle Royale. Lovely. Epic Games really know how to keep a game alive, I'll give them that.
I'm excited! You can view the files, via FortTory, below!
UPDATE: More files have been leaked for the egg, including sounds!
Source: Sr DraBx