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Also, could you elaborate on why you think that ice caps are so surprising? Pluto has an atmosphere that is in equilibrium with the ices on the surface, so it would redeposit these ices on the surface. More ice would be deposited towards the poles since they are the coldest areas. Also, more ice will sublimate in the warmer areas near the equator. Pluto is very far from the sun, so these differences shouldn't be too pronounced, but as you can see they are not.. It is possible however that there is something else that I'm not considering that would make Pluto unlikely to have ice caps.