Battlefield: Hardline is shaping up to be a solid addition to the franchise, and Sony wants to make sure that there are no barriers in experiencing the game the way it is intended to be played.
According to their official blog :
Starting Friday, March 20, at 12:01am Pacific through Sunday, March 22, at 11:59pm Pacific, PlayStation Plus is offering free online multiplayer for all PS4 owners. Just log on to PlayStation Network during the free weekend period, launch your favorite multiplayer game, and you’ll be playing online with your friends, whether you are a PlayStation Plus member or not.Free is always great, and the fact they are opening the service to allow new purchases to play online with little hassle is sure way to bring in more prospective buyers.
Battlefield: Hardline is set to release tomorrow for PS3, PS4, PC, Xbox 360, and Xbox One.
 - Playstation Blog - Free Online Multiplayer This Weekend for All PS4 Players - http://blog.us.playstation.com/2015/03/16/free-online-multiplayer-this-weekend-for-all-ps4-players/#sf8036393