My best guess and from seeing all the recent updates, interviews and letters.... it all looks like their plan here is to basically re-do the whole game almost from scratch. Redesigning battle mechanics as much as 70%, job system and pretty much all other systems... UI, redesigning complete areas, and i'm sure they are redoing from scratch all the content the previous team had almost ready. Not talking about all the new stuff they are working on and that was not planned at all by the previous team.......
Basically when they are done with all this... which will take close to 1 year if you ask me.... well FFXIV will be very different then the game you are playing right now.