Can't say what Cleveland will decide to do next, but I will say that I hope to God it's the bears. Specifically the sloth and sun bear exhibits (although I do think the others could do with an upgrade too). Only because I hate their exhibits for the same reason I hated the tiger exhibits. Small, far away, and moat barrier (I detest moat/cliff barriers). I also recall seeing some concerning behaviour from the sloth bear a few years ago? I think they could definitely do with a more dynamic and extended habitat, perhaps with more opportunities for climbing and exercise like they've done for the tigers.
(I feel like I should mention I am IN LOVE with the Tiger Passage. I think it's absolutely stunning and represents exactly what an animal exhibit should look and feel like. I love how it gives you the feeling of actually walking through the habitat, and not just around it, or looking in from one side. And I LOVE GLASS. The photo ops and ability to observe the animal so closely, thats a top notch exhibit.)