Final Fantasy XIV: A Realm Reborn's birth was beset by complications -- namely that it was too popular for servers to handle. Players trying to get into the reboot are suffering through significantly long waits, if they are able to make it in at all. In order to fix this issue, Square Enix has announced that the capacity of its data centers throughout Japan, North America, and Europe will be increased. As a temporary stopgap measure to keep the problem from getting worse and allow current players a chance to actually play, all digital sales of A Realm Reborn are suspended.
[Thanks to omedon666 and Bartillo for the tips!]