Zoo Map - 1995 - ZooChat
This snowleopard gallery upload of a map from 1995 is the closest thing I can find for a species list that is over 20 years old.
I can picture, of what's listed on this map, the following possible animals in that exhibit:
Hystrix porcupine, American alligator, giant tortoise, coati, or whichever "waterfowl" they had (highly unlikely as they are, the one group directly mentioned, steamer ducks, would be great).
Regardless of what happens, very excited that there will be animals in that space again!
No matter what, everyone in the comments guessing "elephants!" is wrong lol