Data-miners have found all-new styles for existing Fortnite skins in the v9.40 files, most of which are expected to appear in players lockers after downtime for the update ends. Styles are sometimes added to already existing skins in order to update them before they return to the Item Shop, as well as give an incentive for players to buy more skins in the hope they get more styles further down the road.
Here are some upcoming styles via VastBlast - take note, these could either be given to players or they could be part of upcoming Season 9 Overtime Challenges - we'll have to see.
