I'd imagine any large graphical upgrades will be passed on to the console version for as much as the console will allow. If next-gen consoles are released SE will probably work on getting FFXIV released on that too with the improved graphics (Like they did with FFXI on xbox360).

At least that's my take on it, I heard a similar question in regards to CCP's Dust 514 game which is an FPS MMO linked directly to Eve Online, and people asked "what about when the PS4 comes out?" and CCP replied "well... we'll put it on that too."