Very interesting, isn't it? Apparently they have known about the cats for 100 odd years but have only just reclassified them as a unique species.
Coat Differences: Darker in colour, greyer, smaller and more rosettes, double dorsal stripe.
Teeth: Canine teeth longer in relation to body size. In fact, they have the largest teeth of any cat in relation to their body size!
Yume, as they have discovered it to be a seperate species they will give it it's own scientific name.
3nodding Borneo Clouded Leopard

Absolutely striking animal.
Mainland Clouded Leopard. These pics do well to show the difference in markings.^^