I think the next update needs to be the hippopotamus. Compared to the other megafauna on the African Plains, their exhibit is one of the blandest in the whole zoo. And the fact that there's no indoor viewing for them during the winter is a bust. Something like Cologne or Berlin zoo's hippo houses I feel would be a great addition to Dublin Zoo, as it could underwater-viewing such as like whats been created in the sea lions, and potentially become home to many new species for the zoo.
Have to admit, I feel disappointed with Zoorassic World. I've been rooting for a new reptile house at Dublin Zoo for some time, but also wanting the zoo to branch out and get more reptile and amphibian species to put in it. Zoorassic World is great as a new reptile house, and it's cool that it's all about the evolution aspect of reptiles, but it doesn't bring very little new or amazing in terms of live animal species. I've thought of this before about Dublin Zoo's reptile collection: in my opinion, every species aside from the crocodiles can essentially be ordered at any good pet store.
New species wise, Dublin just needs a bear and marsupial species, and they're one of the most ABC species centered collections I've ever seen. According to Zootierliste, giant pandas, both species of black bears, and polar bears lived at Dublin. Is there an enclosure between the tigers and wolves? Because if so, then I would either have sun/sloth bears near the entrence next too the lions, or a larger species of bear such as spectacled or Asiatic blacks to go with their temperate forest neighbors. If a new house could be built for them, I think either koalas or a tree kangaroo species would be a wonderful addition to Dublin, as I don't know if they have the land space for ground-dwelling kangaroos.