When you get mailings later in the year. I believe for our class it was announced early June os so. I think there has been another thread where maybe Profmom had the date for PPW 2006. Right now there is no calendar that has the date shown on it. At this time the only thing you are going to get is a lot of speculation.
Relax - you will have plenty of time when the date is announced to book discount air fare and book a hotel. We did both in July and had not problems and got very reasonable air fare.