First you should find out If any modifications are going to be possible. Second, If it is possible you have the advantage of time, you could get a lot complete before the realese of the game. For instance you could get all of the models done , maybe even some new animations. you could begin some new levels or whatever.
Look upon your soldiers as you do infants, and they willingly go into deep valleys with you; look upon your soldiers as beloved children, and they willingly die with you. -Sun Tzu, "The Art of War"