Fortnite has just released patch v12.10 and a number of new cosmetics have already been found in the game files. As usual, while we don't know exactly when these will be released, we should expect to see them over the coming weeks in the Item Shop or Battle Pass challenges.
A new rarity has been added to the game with the 'Slurp Series' of skins, including Professor Slurpo and Slurpentine. We'll probably see more of these added in future patches.
Here's a look at what to expect (via @Lucas7yoshi, thank you!):