Rates are not yet out. I phoned last month, and was told to phone back for rack rates. Person on the phone didn't know when they would be available, but suggested calling again in July. Their website won't let you book for 2007 yet.
Mickeygirl, yes you can change if the rate drops. I've done this before - booked at rack, which dropped twice before planned check-in. You have to watch for it though, and call them when you notice a better deal - they won't give you the cheaper rate unless you request it.