I would like to see bosses and dunegons from other FF games(1-6) put into Final Fantasy legacy. You could possibly put them inbetween the FFIV ones, but make them actually mandatory, while actually toning down some of the enemies already in play so that you have to level up in the new dungeons in order to get there. This could also coincide with new classes based on the ideas of other games(Not only of FF origin this time?)