Thnx, I just found this out from someone in game. I shouted in Mor Dhona, lol.
From what I was told in game, I asked someone after they explained some things to me if this sounded right, and they said yes.
1. Hookup the PS4 and download the PS4 client if you haven't already (I haven't hooked mine up yet).
2. Unhook PS4 and hook PS3 back up. (I can't have both hooked up at same time. Some people can.)
3. Start the FFXIV client and click the button to transfer character data from ps3 > ps4, then quit game.
4. Before unhooking ps3, go to mogstation and click upgrade to get the download code.
5. Unhook PS3 and hook PS4 back up.
6. Use the code to download the PS4 version of the game.
7. Start game and transfer data to PS4 version same way mentioned in the link someone posted above.
Does this sound right? Can anyone confirm this should work? Or wrong order? Someone in game said this sounded fine, but it was more jumbled when typed in game rather than a neat list so they may of misread.