You know, kittenzan, I think they can't know exactly when the game will be finish.
If they are on the beta testing level (as I think it is), they are waiting for all the problems, bugs, glitches, "stuck villagers", "last pieces of gong", "lost or dropped cauldrons"... etc... that the testers will find and to the manner to solve them!!
As soon as it's not perfect, they will work again and again on it, so nobody can tell when VV3 will be finished.