Sorry I don't know if anyone has posted a section like this or if I'm posting this in the right place.

I am currently playing on the ps3 version and am looking at upgrading to the ps4 version, what I was wanting to know is when StormBlood is released is it going to just be an expansion to the current version of final fantasy 14 or if its a completely re-done game.
I believe when I upgrade to playing on the ps4 I have to buy a new copy of the game for the ps4, I'm just wanting to avoid spending more than I need to when the expansion comes out.