UPDATE: While you can switch from playing Final Fantasy 14 on PlayStation 3 to the PlayStation 4 version for free, doing so means you lose access to the PS3 version, Square Enix has clarified.
Producer Naoki Yoshida told Famitsu (via Siliconera) that the transfer, announced by Square Enix earlier this month, is actually a transfer of login rights, and if you upgrade to PS4 you lose the right to play the PS3 version.
This means that if you want to play on multiple devices on the same account you need to buy another copy of the game.
Meanwhile, Yoshida said the PS4 version of the MMO runs in full 1920x1080p resolution, and you can use a keyboard and mouse to play. Alternatively, you can use the touchpad on the DualShock 4 controller as a mouse. He said the PS4 version should be indistinguishable from the PC version. While the game supports remote play on Vita, Yoshida said it would be tough to play because chat windows would be small.
ORIGINAL STORY: You'll be able to switch from playing Final Fantasy 14: A Realm Reborn on PlayStation 3 to PlayStation 4 for free, Square Enix has announced.
Those currently playing the PS3 version of the monthly subscription-based fantasy MMO will not have to re-buy the game on PS4, Square Enix said, and will be able to transition to playing on the next-gen console at no additional cost. You'll also be able to carry over your character data and continue playing on PS4.
A beta test for the PS4 version begins on Saturday, 22nd February 2014 - the day the PS4 goes on sale in Japan.
"Essential work to increase the number of servers and strengthen the service environment, with the aim of alleviating the crowding on existing servers is also in progress," Square Enix added.