For their centennial, the zoo has a few special signs set up around many of the exhibits. A few of them like this one included illustrated concepts for future exhibits.
At the time of my visit, the current exhibit was closed as the previous tigers had tragically died due to various ailments and the zoo hadn't acquired the new ones yet. While to my knowledge the current exhibit is satisfactory, this concept does look like it would be interesting to see if it gets built.
There was also a very nice and moving "In Memory" bulletin for their prior four tigers - Grace, Ginger, Molly, and Milou. Unfortunately, I think I accidently deleted my photo of it, but if I find it maybe I'll post it too.