Not sure how PS3 / PS4 works, sorry
But from the patch notes, it looks like they will add some new default keybinds etc.
So it could mean the custom keybinds you have / used will be overwritten by default
(mine took about 2 hours to setup)
Could also be the same case with HUD etc, since they are changing how some windows look / new macro icon etc.
So you should back up your profile.
They are at My documents > My games > FF14 - ARR
Just make a copy of that folder