There is a real range of popssibilities, even for the smaller species like Cuvier dwarf caiman or Philippine or Cuban crocodiles! Well, my personal pet peeve ..., it will be interesting to see what will replace the alligator or if the new Reptile House will have room for a crocodile species of sorts?
Given the design of the exhibit in question, Philippine or Cuban would be a potentially-disastrous choice if they didn't want the new inhabitants to escape with great rapidity