Fast search says back in 2012/13 time frame Cycles got Open Shading Language as part of the code. So it should not be too hard to put it into Poser and then have that call the proper render engine. Since for the most part a shader is just a bunch of math formulas put into a visual box to make it easy for a person to use. The nice thing is that done properly it will allow any render engine that uses OSL to be used in Poser. So there will be a slightly new node system to use but nothing that will so different, which is why it was a good idea for the old team to have made SuperFly the way they did as it makes it easy to use the new nodes and allow all the knowledge of the past 20 years to been kept.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13