Yesterday, for some reason, several upcoming skins were revealed.
New skins are shown by people searching the game files during the upgrade. Yesterday evening there was no such, and yet some completely new skins leaked. From what the informers inform, the phones update was too early and hence the access to new items.
These are probably new cosmetic items that were to appear in Update 10.40.
New skins at Fortnite
Below is a full list of new skins that will probably appear in patch 10.40.
Update 10.40 has not even been announced, we do not know the date of its release.