There is some info here although it is not all current...
http://www.wdwinfo.com/Just_for_kids/birthdays.htm
The info I got this week was...
Neverland Club Parties
2 Hrs.
You pick from 5 themes: mickey/minnie, sports, princess, pirate or tinkerbell
Pizza and juice for the kids
Cake
Games and crafts
Goodie Bag
Basic: $36.21 per child (min. 10)
Premium: 73.49 per child (min. 10)
The premium package also includes a visit from a character (based on chosen theme) to visit for 1 hr.
We are having the pirate theme and having Pirate Mickey come for a visit. Last year, we chose a Luau theme (no longer available) for my daughter and we had Lilo come. It was lots of fun.
My favorite part of the party was when Lilo sat down and watched Lilo and Sticth (the movie) with us as we ate. It was really cute.
It's expensive but definitely a great experience.