Ignore the "blue skies and water" headlines on the internet. Go straight to the NASA page for factual details which are still incredible:http://nasa.tumblr.com/post/130763030639/what-have-we-learned-about-pluto
Images returned from the New Horizons spacecraft have also revealed that Pluto’s global atmospheric haze has many more layers than scientists realized. The haze even creates a twilight effect that softly illuminates nightside terrain near sunset, which makes them visible to the cameras aboard the spacecraft.
Today, a new announcement was made about Pluto’s atmosphere after the most recent image returned from New Horizons showed that Pluto’s hazes are blue. The haze particles themselves are likely gray or red, but they way they scatter blue light has created this tint.
In another finding announced today, New Horizons has detected numerous small, exposed regions of water ice on Pluto. Scientists are eager to understand why water appears exactly where it does, and not in other places.