The Aardwolf is surely too old to breed - the question is if it'll be replaced after it dies (which I don't know the answer to, except that it probably depends on whether Hamerton or Sandwich have any breeding successes in the next couple of years).
What happens with the leopards will be up to the EEP - I'd imagine they will ultimately have a female leopard assigned but it could be a way off yet.
According to ISIS (
http://app.isis.org/abstracts/abs.asp), the spider monkeys are:
Colombian: 1.1
Long-haired: 1.2
Red-faced: 3.1
And a single hybrid animal.
Not sure about the ages of these animals but I don't recall any recent breeding.
The Javan Langurs are 6.3 according to ISIS (you must know those are a mixed group just from looking

). Not sure when the last birth was.
ISIS says 2.3 Bat-eared Foxes but again these may be too old to breed.
Really it's very difficult to say for certain which animals are potential breeders without just asking the zoo - otherwise you can't tell what animals have been castrated, are on the pill, are too old, are too badly imprinted...