Epic has released a post on Reddit outlining the release date of Season 5 as well as an upcoming Double XP weekend for Fortnite Battle Royale. Here’s the summary:
Season 5 start date
Season 5 will now begin on July 12th at 4AM EDT/8AM GMT with Season 4 having a two day extension.
Double XP weekend
From June 29th (4AM EDT) until July 2nd (3AM EDT), players will receieve an additional +100% match XP to help towards finishing off Season 4.