Room only can be booked 500 days from check out at a non confirmed rate. When the rates come out in June they will send you a new room rate. When the packages come out in August you can "switch" if you want but you are cancelling what you have and starting again. The reason you may want to do this is if you are set on a specific date and a unique room type. If you are looking for something very general like a standard room at POP, there is no need to go through all the extra work unless you feel better knowing it is started,.
HTH