Graphical effects are created on the PS2 devkits, which the supply is exhausted. Thus they can't make new monsters, new WS animations, new job ability animations, new armor skins, new zones, or new spell animations.
Notice that what we have been getting since November is nothing that requires new graphics? That's why. Such development is over for the PC game, and the only hope for new stuff like that is going to be in the mobile remake.