This is exactly how it works. An entry for the game will show up as both PS3 and PS4 both separate. I upgraded my copy of Battlefield 4 from PS3 to PS4 and now I would have to buy the PS3 version if I ever wanted to get the trophies. You would not be able to go back to PS3 to unlock them however but that being said with FFXIV your account carries with you so I would imagine they would unlock on the PS4. More than half of my trophies were achieved on the PC and I had no problem getting them on the PS3.
Huh? if you upgraded, you can still play BF4 on PS3 and PS4
I have the disc version of PS3, paid the $10 upgrade fee for PS4, need to keep my PS3 disc in PS4 as an activation key
Trophies work in a weird way, you can earn trophies on the PS3 version, do something in the PS4 version and they unlock MP speaking, SP has to be played all over again, but if you unlock something in the PS4 version, they aren't retroactive, you would have to re-earn them on the PS3
So PS3 => PS4, YES!, PS4 => PS3, NOPE!
Even digital works the same way for BF4 PS3 and PS4 if you do $10 upgrades, only way you don't qualify for PS3 trophies is if you never bought the PS3 version or bought the PS4 version only
I rather not take the chance of fucking myself some way after earning these hard trophies, I rather get 100% on PS3 and just transfer over everything to PS4 in tact
I don't want to have any problems arise through SE account management, it's a whole hassle unto itself
I'm 29/39 on the trophies, can really get most of them by the start of 2.2
Get roughly 36/39, then it will be the leves, turn 5, holding me from the Plat