Character Designer Janos Hunyad shared a free Import ZBrush PolyPaint tool for Maya. As the name suggests, the tool will allow you to import Zbrush PolyPaint into Maya, without UV and channels. Now, with a simple installation, you can easily import Zbrush PolyPaint into Maya.
Import ZBrush PolyPaint for Maya is a plugin and script that currently supports Autodesk Maya 2015 on the Mac.
Janos states that you can compile a version of Windows according to the application.