One note in response to the author of this story. It would hardly be responsible to build a noisy roller coaster on top of all these animals. There are many places in Busch Gardens to build coasters, and they do so with some regularity. The last thing they should do is stress out and scare these poor animals just so you can have one more roller coaster. For that matter, it would also destroy the effect of all the theming and atmoshphere that they've just spent many millions of dollars to create. Don't worry, they'll build another coaster but hopefully they'll do so in a more sensible location.
I'm a big fan of Busch Gardens Africa and am glad to see them continuing to develop the park. I also agree with Erik that I'd love to see more attractions like Dark Kastle or something similar to further round out your options for fun.
I am also interested to see the Tiger Tug-o-War. I'm envisioning major rope burn and/or limbs ripped off by the rope. Hmmmm... Perhaps it should be a Howl-o-Scream event.
In all seriousness, I've played with tigers when I used to volunteer at Big Cat Rescue (forerly Wildlife on Easy Street). Tigers are incredibly strong. I'd love to try a tug of war with one.