Poser's implimentation of the Tempest renderer, AKA Firefly, may very well just be simplified to death, because they know the majority of their user base doesn't like to be burdened down with complicated parameters they can tweak.  Obviously this doesn't please advanced users.  I expect a Pro version to be much more like Tempest, which I never really used myself, but have seen screenshots and read discussions about it.  Pixel3D users seem happy.

If the vast majority of users who export their scenes to other highend apps do it mostly for the faster rendering, then that explains why Poser is adding the export options to output scenes into highend apps, and serves to futher convince me that they aren't switching to some other kind of render engine natively.  They'd have to ditch the majority of the shading and rendering technology they already have and re-code everything new, or invent some kind of conversion script, which still wouldn't be perfect.  Seeing how quickly they announced this Pro release after the version 7 release, I can't even imagine that's the case.  If it is, expect huge problems in the way of bugs, and some people's heads to explode here in the forums.