The Egyptian temple is one of the older buildings in the zoo. It currently houses 2 young bull Asian elephants (one of which will go to the sister park, Planckendael, this month), 4 hybrid non-breeding giraffes, and will come to house the breeding group of Hartmann's mountain zebras indeed. In the middle of the visitor area is a skeleton of the zoo's very first Asian elephant.
Historically, it has housed a lot of different ungulates, and within the last 10 years it housed oryxes and pademelons, on top of breeding groups of Asian elephants and kordofan giraffes. All of those groups have since moved to Planckendael, and have been replaced by the 'dead-end' or 'bachelor' groups present today, as the smaller groups suit the smaller exhibits much better.
EDIT: It seems the zebras are already present as of yesterday.