It's a golden lion tamarin. What other species does the zoo have in the Americas pavilion that lives in the primate wing and is even close to that colour. Looks more blond probably due to the window glass, and probably the way the light is hitting it. To my knowledge no new species are do in (other than maybe the pygmy marmosets which dont go outside, wouldn't be that big or colour and would not be arriving as all transfers are on hold) and that exhibit looks like its the tamarins.
@DelacoursLangur There are already 11 photos of the Golden Lion Tamarins at this zoo in the gallery. Adding photos that are out of focus and barely show the animal creates clutter in the gallery, especially when there are already ample photos available.