Not actually an exhibit but rather a new outdoor off exhibit yard for the jaguar(s). As they will spend most of their time in this outdoor yard it seems like it will be a huge improvement.
Yes it is indeed on the roof. The DWA is located in Downtown Dallas so available space is at a premium, so the new holding area is on the roof. When I drove by a few days ago this new area looked quite lush, but I was just seeing it from a nearby highway so I'm in no place to comment on its current status.