I'd just like to see them build full time exhibits for the species in the rotational exhibit in the Africa section. Would be great to see hyenas and jackals consistently.
I agree that it would be great to be able to see all the waterhole species consistently - but it would require a lot of separate exhibits (one for lesser flamingo, warthog, aardvark, spotted hyena, black-backed jackal, cheetah, and silvery-cheeked hornbill). I've been brainstorming a bit on this, and one possibility I've come up with is turning the waterhole into the permanent cheetah exhibit (much larger than the current cheetah exhibit, which is, to my mind, the most disappointing exhibit in the Heart of Africa). This would allow the waterhole to continue to be used for the cheetah runs (and the free-flight hornbill demonstrations), and would free up the current cheetah exhibit to become (with modifications) a combined exhibit for warthog and aardvark (recognizing that the aardvark would most always be asleep). I could see the main savanna incorporating the lesser flamingo in some fashion, leaving the spotted hyena and jackal as possibilities for a phase II of Heart of Africa.
Having said that, I have grown to appreciate the rotational aspect of the waterhole. One of the key benefits is that rotation of species means that whatever species happens to be out is active (I've never seen the jackals, hyenas, warthogs, or any other species asleep or impossible to see while on exhibit in this section - while noting that I've never managed to be there when the aardvark was out). For the casual guest, the rotational aspect does seem to result in a much more lively exhibit. I view all the waterhole species as essentially animal ambassadors/education animals - just more of the many species not permanently exhibited by the zoo (and in that vein, I'm just happy that we get to see these species at all, given that at least two (jackals and hyenas) were added after the Heart of Africa was completed and would otherwise presumably not have been exhibited until some new addition was completed).
I would love to see work done on the (once promised) second phase of the Heart of Africa - hopefully with permanent exhibits for the aforementioned carnivores and with some added exhibits for smaller African animals (as others have noted, the absence of small mammals, birds, reptiles, and any other species is striking in such an exhibit, especially as compared to most of the other zoogeographic themed sections of the zoo) and one or two of the promised larger species (in a dream world, African elephants, but I'd settle for hippos or even a more appropriate location for black rhinos). I'd also love to see the zoo draft of plans for the long-promised but seemingly abandoned South American section or the shores addition (with pinnipeds and diving birds) to complete North America. However, even if the powers that be decide to focus more on renovation/improvement of already existing areas (in the vein of the improvements just completed in North America), they could do a lot worse than starting with the penguin exhibit - a real disappointment and probably the worst permanent exhibit (and one of the oldest) still standing.