It is possible that Fortnite will be adding a second map to the game in the following weeks. Ninja teased the new map during a stream, saying that a brand new map is being made for the Samsung event which will be taking place on March 16th.
It isn’t clear whether it will be a completely new map that will be available to everyone or an event only map.
The Samsung announcement states that it actually won't be a brand new map. Instead, it will be a custom Creative Island.
“...on a custom, never-before-played Fortnite Creative island.”
It’s hard to be sure since Ninja made it sound like a new map, while Samsung is downplaying it. The only way to be sure is to wait for the event, but a new map would be exciting.