How exciting! Sounds like your planning is in great shape. You and the family are going to have a wonderful time.
I warn you, your first trip is going to get you hooked and you won't be able to stay away! I went last August for the first time in 15 years, still loved it like I was kid, so I'm taking my mom in 2 months. Ha ha
Take plenty of pictures and I agree with previous posters...PhotoPass is great!