With Fortnite update 22.40 octane from rocket league entered the game and you can find it in the map by playing either battle royal solos/duo/squad with building and with zero building. Also in collaboration with rocket league new challenges have been released regarding octane where you can collect infinite xp and get free rewards
In addition, with the new update 22.40, the grappler glider was added to the game, where you can also find it on the map in chests, chrome chests, and supply drops