If memory serves, they typically announce the dates of the next year's in the current year's program, e.g. the 2012 Disney Princess program will have the date of 2013's Disney Princess race.
The 2012 race is Feb 26, and from what I've heard, it's either been that last week in Feb or the first in March.
I just completed the race, my first half-marathon, this past weekend. It was pretty awesome!!! It was a great accomplishment for me as I didn't think I could do it. I started training in October of 2011 but after my first week I was injured and couldn't start training again until December...I must admit, I did not give it 100% (training) so I was soooooo nervous as the race got closer. Anywho, I can check that off of my list. Now I want to do it annually, if I can. So, I plan on doing the next princess half in 2013. The dates, which were in our packets, are February 22-24, 2013. Good luck to you all. If I can do it...anyone can