Thylo-
So currently the zoo has: Gorilla, colobus monkey, mandrill, wolf's guenon, pygmy marmoset (maybe), gelada, bushbaby, Javan Langur, Silverleaf Langur, White cheeked gibbon, slow or pygmy loris, squirrel monkey, crowned lemur, sifaka, ring tailed lemur, brown collared lemur, grey mouse lemur, red ruffed lemur and seasonally they have the capuchins and some New World Monkey species. The main loss of the monkey house is that at least a dozen primate species are gone

And the last two times at the WOB they had removed the primate species so I'm not sure if eventually they will go on display somewhere else or they have moved them to other zoos.
I do hope when the Javans are phased out that either crab eating macaques or lion tailed macaques go there as a new species. A guenon species should be added to the mandrill habitat too, the sign is still there for the Debrazza; but it's been several years since I've seen one.