Id like to see a similar attraction in AK. something themed to North America. They really need a North American section to the park
In continuing with the "A" theme -- Africa and Asia -- I'd like to see new areas based on the "Americas" (North and South), Australia, and Antarctica.

So I'm joking a bit with the "A" thing, but I do think those new sections would add a lot to the park. There are plenty of interesting animals indigenous to the Americas, not to mention all sorts of marsupials from Australia. An Antarctica section could be largely indoors, and take most of its design cues from the Glacier Bay area that was planned for HKDL.
I don't object to Avatar per se, but I do think there are so many opportunities to expand DAK in really fruitful ways that are based on actual living animals.