Here is my prediction for what we could get. First what we should get in Update 1.13
The Giant Malaysian stick insect and the 3 beetles(Scarab, titan, and Goliath) could be exhibited in both the classic and the new walk-through exhibit. They can fly too albeit in short bursts. Also, I would like to of course see animal talks come to the walk-through exhibits. Where the educator walks through and has an insect land on their shoulder during the talk(The butterflies and the insects mentioned above). Also, expand the inter-species thing, let the titan beetle have IE bonus with the New World Butterflies.
As for DLC, I'm not totally sure. Personally, I think to coincide with the new mechanic of flying beetles, I would LOVE to see some more flying insects like the Hercules, Elephant or Rhinoceros beetle, giant long-legged Katydid, and some moths like the Atlas and Luna Moth. Maybe also we could get small mammals like the Sugar Glider or Prevost's Squirrel or a small primate like a Marmoset or Aye Aye. I want birds too but We should work our way up and let the Frontier get the mechanics just right.