http://wccftech.com/fortnite-battle-royale-out-and-free/

The Fortnite Battle Royale mode officially launched on PC, PlayStation 4 and Xbox One and is completely free to play, while the PvE component of Fortnite remains in paid early access until early 2018.

You can now team up with friends in duos and squads (1-4 players), and teammates can also revive you with a down-but-not-out mode.