I agree (and hope) that it is an interim step - just to clear the area for when they are ready to add a new exhibit. Those familiar with the zoo know there are two sides, separated by each other with a long tunnel under a road. If they were to shut down this old side entirely and only have the other side open (Wilds of Africa, Giants of the Savannah), it would still be an outstanding zoo - perhaps the best in the Southwest.
My personal hope would be to turn the old side into a strictly Asia theme - since they already have the relatively new and excellent tiger and otter exhibits.
Any plans than for Asian precinct?
What about building on the African Giants theme and hippos and/or new rhinos.