Honestly, almost none of these would fit in the "clone" category for me. For most of them the models need to be changed drastically. We don't have anything that comes even close to a siamang.
Clonse I'd like to have would be
malayan tapir, grevy zebra, another form of giraffe, european grey wolf, asiatic lion, wallaby.
I'd love the sumatran orang utan, but would not consider it a clone. To be fair, I don't get what all the fuzz is about when other species of cats,canines and bears are added. For me, they all add to my zoos and I would be very happy with another bear (spectacled bear for example, or a coyote or an africal leopard AND an amur leopard. The only problems this animals have is, that they take way an animal spot. That woiuld not matter with 12 animals in a pack, it does with 4.
As for the clones (in my opinion) I bolded here, I would not want them in a pack. For me, this would be the perfect oppurtunity to start the "animal of the month" routine
@markun suggested somewhere and charge maybe 1,50 € for it. Having a new animal each month and bigger packs with more unique animals every 6 month and added features would be a dream come true.