Now that 3D Coat has PBR creation, could we perhaps get MDL output for it?
MDL is NVIDIA's Material Definition language. This is used by Iray 2015, and Mental Ray 2015. Should also be in Vray by years end. I seem to recall from GTC that both Unity and Unreal were also saying they were including it, but someone can correct me on that. Allegorithmic has also said they will support it.
Some references:
http://www.nvidia.com/object/material-definition-language.html
http://www.nvidia-arc.com/products/iray/mdl-materials.html
http://www.mdlhandbook.com/