Here's a more official note

Worth noting:
"The addition of new playable races will impact more than the development cost of the items added in 5.1 and subsequent updates. Not only will we be transitioning from twelve variations (six races, two genders each) to fourteen, but we will also need to commit more resources to the development of new emotes. While FFXIV will continue to strive to maintain a regular 3.5 month major update cycle, we must also ensure that sufficient time is secured for the meticulous development of new content—or else the quality will invariably drop. This is a complex problem that can’t be solved simply by throwing more money or people at it, as it impacts both debugging and QA."