OK, I was wrong. We went ahead and paid the extra $500 to take delivery on our 2009 Prius. I guess we'll get the $500 back if we ever sell it (it will be a year newer than a 2008).
This car is fantastic! It is very comfortable, and we have gotten over 46 mpg since we bought it. It has made 2 trips to San Diego in 2 weeks. Can't wait to see what the future brings.