"Poser textures are incredibly simple." 

Croc, if all you want is basic map support then you should look at PoseRay's Kerkythea translation. In a couple of minutes you can have your Poser pz3 loaded into a render that supports GI, Maxwell style MLT and all kinds of goodies, albeit probably only for for still renders. Other than the current options for Carrara, Vue, Kerkythea, C4D, yafray and POVRay, or the Renderman path via DS, I don't imagine we're going to see anything else in the forseeable future unless AutoDesk buys Poser.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken