You can book the room now and pay 1 night deposit in the amount of regular season rates for this year. When new rates for 2005 are out you will get an updated confirmation if your rate changes.
I did this for both of my trips this year. I booked in March of 03 for May 04 and Sept 04. The rates for 2004 are the same as 2003 but some of the seasons moved a little. (holidays and peak season). When they released the rates for 2004 my May ressie did not change but my Sept went down for the regular season to value season. So the extra money goes towards the rest of the balance so it was ok.
You are booking a room not a rate so go ahead and book when your ready.
Lori