@zooboy28: Next up is the relocation of the current tiger exhibit to the stretch of tramway between the gaur and thamin exhibits. Construction has already started and should wrap up by early next year. This is supposedly part of the larger plan to relocate the species in the present Indo-Malayan zone (tiger, babirusa, anoa), to make way for an expansion of the Africa zone. I don't have any details on the expansion though.
The new tiger exhibit (viewed from the tram) has been completed and it addresses a common complaint of visitors - the tigers are too far from the tram (due to the wide moat) and thus difficult to see. So in place of a moat, the new enclosure is fronted by a large seamless pane of glass. I've only seen daytime pictures, but I would guess that with clever lighting, the glass would not be visible at night, giving the effect that there is nothing separating the tigers from the open-sided tram.