Another exhibit for Japanese Macaques in Northern USA?
Not my taste. If there is no way(!) to keep Polar Bears in a new, extended exhibit, then I would transform it into one for Wolverines. That would fit perfectly with the "adjected" Grizzly exhibit OR with the nearby Northern Ponds/Tiger Mountain to a Siberian theme.
A transformation to an extension of the Himalayan Highlands would be a good idea imo too. But I don't know if there is enough space for a group of Takins then. Binturongs are fine in Jungle World (if this hasn't changed since my last visit), so I see no need for another exhibit (beside the chance that they could enjoy "fresh air").