https://www.gamespot.com/articles/fortnites-new-playground-mode-is-still-down-but-te/1100-6460056/

Update 4: Fortnite's Playground mode is still unavailable a day after it was set to return. Epic says progress is being made but it's trying to avoid rushing into pushing it up. "We're continuing testing on our matchmaking improvements and are still aiming to open the Playground LTM as soon as we're confident in our improvements," it said on Reddit. "Once we have confirmed that our testing was successful we will begin gradually rolling servers out to all regions and platforms until it's available to all players."

Subsequently, Epic said on Twitter that it's "continuing to test improvements that are needed to enable the Playground LTM." We haven't gotten any further word on where things stand with Playground, but the other new limited-time mode added alongside this update--Final Fight Teams of 12--has been removed in response to player feedback. In its place, 50v50 has returned to the game with some changes. And with all of this happening, Epic is teasing that the mysterious rocket could launch on Saturday.