A report earlier last month suggested that Fortnite would be coming to the Nintendo Switch. Earlier a photo leaked which revealed Nintendo's possible announcements for E3 2018, in which Fortnite was once again listed. In case it wasn't all but confirmed, South Korea's ratings board has revealed that Fortnite will indeed be coming to the Switch.
Given that games need to be submitted to the ratings board for approval and a subsequent audience rating, this is as official as it gets until Nintendo announces it themselves. E3 2018 is scheduled to take place later this month and we expect that the announcement will also confirm its release date, which hopefully won't be too long.