It'll happen when it happens.
And when it happens, I pray they make the materia system not suck.
Having played through it again, gameplay wise, the game was shit. Plot wise, it was one of (if not the) best thing they've ever done. Graphically, at the time, it was amazing. But the entire system of advancement revolves around upgrading interchangeable balls of magical energy, none of which actually bind to any character in any way, meaning you're not leveling up or customizing a character, you're just farming magic balls.