Working on an expansion with the game in it's current state would be a massive insult to anyone. Everyone not working on the current game is a dead weight.

An expansion tackled on top of the main game has little impact and feels superficial as opposed to remaking the vanilla from the ground up. We don't even have half the regions of the vanilla available to us yet, Ishgard included.

E3 is for unreleased games. FFXIV was released in September last year. E3 is not for hyping ported versions of old games.