Put me down for the DAK Australia expansion. They do have lot of very interesting animals. And an area themed to an Outpost in the Australian Outback sounds interesting.
Originally I was thinking about adding something like an Amazon River Boat ride. But it would be too similar to The Jungle Cruise. And after investigating the critters that are in and around the Amazon River/Rainforest, I found that they don't have all that many large animals that could be seen from a boat. It is interesting that they have 1/3 of all the species on earth, but very few large land animals. Capybara, giant otters, Anaconda and Panthers are the most interesting. They do have a bizzilion types of very deadly tree frogs and HUGE spiders, but they would be hard to see from a boat or even a truck.