When I reserved mine in April 2007, I was given an estimated price. When I configured, I was given a quote (very close to the estimate) and told it may vary slightly. My dealer charged me exactly what I was quoted when I picked up in May 2008.
2009 models will be different and I expect them to cost a couple grand more due to added MHD, other features, falling dollar (since mid 2007) and other factors. They're still pressured to keep the price in line with a Yaris and Fit, if only to get a few more people to realize there are three options instead of two. When it comes down to it, you'll get your quote at configuration time... which I think is on hold for a few months. You have the choice then to decline or accept, and worst case you can decline when the dealer calls you.