Friends of mine went to the luau last Spring. It has a general "Lilo and Stitch" theme. Some of the songs from the film are performed. They serve food sort of "family style" and I know my friend mentioned some kids' food was available (macaroni and cheese I recall). While you eat, there is a performance, some hula dancing, singing and the kids' favorite, fire dancers. There is a volcano-type dessert which also impresses the little ones. The luau closed for a rehab and re-opened last Spring, yet the overall impression is the same: " food is plentiful and good (not great) and the show is fun." Beverages are included and fluffy drinks are extra.
WDWIG.com has a nice section with reviews and comments about the luau. I think it is under the dining section.