Well, this is my son's favorite park and we have no trouble spending a full day there. There's more to a theme park than rides, rides, rides. With AK, anyways, the animals are/should be the main attraction.
That being said, since we're talking about non-existent animals here (and because this is expected to drive attendance to AK and keep them there), I fully expect the fauna on Pandora to be presented in a more traditional theme park manner than in a zoo/animal exhibit one.
Personally, I think it'd be kind of cool to have a "Walking with Dinosaurs"/"How to Train Your Dragon Live" type experience w/ "xenobiologists" teaching us all about them. Obviously something will go wrong, prompting a bunch of Nav'vi to save the audience. Really blow us away w/ next-gen animitronic creatures and not a Soarin rehash.