Final Fantasy XIV: A Realm Reborn was released worldwide yesterday, but despite the fact that the beta had over 150,000 players, Square Enix wasn't ready for the "overwhelmingly positive response." Due to this, players of the MMORPG are currently facing long wait times, and some can't even manage to log in, being unable to play the game.
On the game's Facebook page, Square Enix announced that the the digital version of Final Fantasy XIV: A Realm Reborn will be removed from sale, as a temporary measure. The producer apologizes to their fans, and promises that the server's capacity will be expanded in the next few days.
Both the PC and PS3 versions of the game were already removed, so if you were planning to get the game now, you will have to wait a bit longer.
Source: Final Fantasy Union