I had the same confusion when I tried to book a CP dining package for that week.
The WDW dining website has a live link for CP dinner packages now. You can select the restaurant, date, and number of guests, but it'll always pull up no availability.
So I spoke with a reservationist, and she said the packages aren't out yet and they've been told to tell guests to keep an eye on the Disney Parks Blog for an announcement. She mentioned the packages came out in July last year, but they could come out sooner this year if the website is already showing up. However, the website likely won't work until the packages are actually released.