Square Enix confirmed during the Letter from the Producer Live XI Broadcast yesterday that the PlayStation 4 version of Final Fantasy XIV: A Realm Reborn will not require PlayStation Plus.
To participate in online multiplayer, PS4 owners are typically required to have a PS Plus subscription. However, Square Enix was able to make a deal with Sony for their latest MMORPG.
FF XIV does require a subscription itself, but this move makes the PS4 version no more expensive to play than other ones. The game is set to release in April.