Just as a 3rd party spectator, I highly doubt Chaosgroup would bother creating a plugin version of Vray for Poser, at least at this time.  3 reasons come to mind immediately.  1) Vlado is already busy getting the renderer to work like it does in 3dsMax with other apps like Maya, Rhino, and soon Cinema4D.  They also have a Truespace plugin, and a standalone version is said to be in the works too.  2)  Chaosgroup is known for their extremely helpful community and forums.  I think the last thing they would want or need right now, considering all the new formats they're supporting, is to be flooded with bewildered Poser users who have absolutely no experience working with a high-end raytrace renderer.  3) Poser's shader structure is based on the renderman-compliant shader system, if what I'm hearing is true.  A new shader system would have to be integrated into Poser or some kind of conversion system would need to be implimented, and I simply don't see this laborious task happening any time in the near future.

Far more likely, if there's any change at all to the renderer, it would be that they are adding some more advanced controls to the Pro version, and exposing more features for advanced users to tweak and fiddle about with speed and. quality parameters.  If GI is exposed in the render features, this alone will require a new set of advanced parameters in the render dialogue.