Little is known about the gameplay currently. However, the game is rumored to be heavily inspired by Minecraft. This game is a survival sandbox game with much of the building focused during the day. There is also a Leveling system, classes, weapons, armor, traps, and boss fights at a high chance.
Fortnite was on July 12, 2012 announced to be the first game to utilize Unreal Engine 4. It was stated by the developers that the game will be only released for PC and/maybe next Gen consoles. The reason being this is due to the fact that Unreal Engine doesn't support 7th generation consoles.