I wanted to submit an idea for another monkey I figured why not the olive baboon and maybe the gibbon I feel like we need more monkeys
I hope we will get the Hamadryas Baboon and a second Species (Olive Baboon or similar looking)Gibbons are not monkeys. They are apes.
In any case, I, too, want a gibbon of some sort. Preferably the siamang or the white-cheeked gibbon. As for baboons, the Hamadryas is the more commonly-kept zoo species, not the olive (which was only popularised due to Zoo Tycoon back in the day). Auckland Zoo here in NZ used to keep chacma baboons but when that population died out they replaced them with Hamadryas (as was the trend). I suspect the one we'll eventually see however will be the gelada.