First of all, beautiful baby!
Okay, now to the question. You can book a room only reservation right now. You'll be booking at the 2007 rates and your rate will be adjusted when the 2008 rates come out.
You can not book a package yet. If you book a room only, you can change it to a package when the rates come out.
I've been calling WDW reservations almost daily (sometimes more than once a day) to find out when the 2008 rates will be released. During most conversations, I have been told mid-August. This lines up with the last two years. I booked our 2006 and 2007 vacations on August 15th (just days after package rates came out). A coupe of CMs have told me that it could be as soon as the first couple of weeks of July.
The good thing about booking a package way ahead of time is the fact that you can be making payments all along the way. I booked our June, 2007 stay on August 15, 2006. I paid the $200.00 deposit and made over 40 payments on the vacation. Disney doesnt care how much you pay ($20 minimum) or how often you pay so long as you pay the balance 45 days prior to your arrival. It's like having a vacation on layaway!
Hope this helps, Lisa