Fortnite Season 4 does indeed see a comet crashing into the Battle Royale map, adding a new area, Hop Rocks filled with an alien new item.
While the game is still in downtime between Season 3 and 4, the iOS version has added details to the App Store a little early:
"The comet has crashed and brings new locations to explore! Jump in and witness the aftermath of the impact while you level up your Battle Pass and earn all new loot.
"HOP ROCKS - The comet has left a mark on the island... Visit the crater and you’ll find glowing rocks all around. Consume them and lift off with low gravity!"
Source : IGN.com
