Fortnite has just released patch v12.41 and a number of new cosmetics have been found in the game files, including styles for existing skins.
The new Icon Series skins relating to Travis Scott's Astronomical event will be available in the Item Shop starting today, April 21st. As for the other items, we're not sure, but we should expect to see them over the coming weeks.
Here's a look at what to expect (via @Lucas7yoshi, thank you!):