The colors make the planet's rugged mountains, which show up in red and brown, look even more distinctive compared to the beige-colored plains they border. 

A partial view of the planet at a specific infrared wavelength shows that the different colors also line up with different chemistries: methane ices are much more common in the icy plains of Pluto than they are in the mountains.

New Horizons is currently moving deeper into the Kuiper Belt, heading for a second rendezvous with one of the bodies there. Meanwhile, data from the Pluto visit keeps on pouring in; we'll continue to provide updates as it is made available.

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From NASA:

This this high-resolution enhanced color image of Pluto was captured by our New Horizons spacecraft during its July 14 #PlutoFlyby. Pluto’s surface sports a remarkable range of subtle colors, enhanced in this view to a rainbow of pale blues, yellows, oranges, and deep reds. Many landforms have their own distinct colors, telling a complex geological and climatological story that scientists have only just begun to decode. Details: http://go.nasa.gov/1NXtUQb #NASABeyond

Compressed (jpg) 8K image: http://imgur.com/x7A08bP

Imgur comments: http://imgur.com/gallery/tpiHe1t