I am gonna answer your questions:
1.) The Himalayan Thar yes, the takins not, sadly
2.) I am sorry, I am not into birds, fish or amphibians but for the mammals I want to tell:
bear colobus monkeys, giant Pandas (ofc), the coming Onager and Pangolins will not arrive until then but if you are interested in reptiles: Do not miss the "Artenschutzentrum", which you can find near the Buffalos.
3.) With enough patience you can see them, but the house is very closely, but good for the birds, I never see more then 2-3 species because they can hide themselves well.
4.) there are no bearded vultures anymore, the Egyptians vultures are next to the bird house, the other two should be in the Artenschutzzentrum, but I don't know sadly, good chance, they are just behind the scenes.
I hope, my answers will help you a bit