Well, considering that some of FFXIV's biggest rivals have managed to expand character customisation I don't think that it is unreasonable to expect the development team to do the same thing. WoW is a much older game and has added multiple new playable races over time and has also revamped the character creator not once but twice. PS02 also recently upgraded the game's graphics considerably, I believe. To say nothing of the fact that many pseudo-MMO's such as Monster Hunter World and even single player games are competing for people's attention in terms of ongoing investment.

So yeah, it might not happen and we might not get the missing genders and/or a revamp of the character customisation system but it's been consistently in high demand to the point where it'd be a genuine disappointment for many if we go without. I want everything to be bigger and better this time around. That goes for story and staying power of content in particular.