That is quite worrying and a little confusing. I assumed that when a game is in "full production" is when the engine and assets are created, and from the trailers already released it seemed like they were well under way with that stuff.

Hopefully all these delays are to the games benefit. Square always assure us that the game is coming along smoothly but I'd argue the game has been in somewhat of a development hell for the last few years. Why on earth would they take so long to get this game made?